My wife and I retired in our 30s and now travel full-time in an Airstream trailer - here's what we spend in a week

Summer tends to be our most expensive months because of our need for air conditioning to escape the heat. If this were the winter, our campground costs get reduced due to our ability to live off grid for weeks at a time. Gotta love free camping!

My favorite thing to spend money on? Visiting a brewery wherever we happen to be and sampling the local beer.

We packed up and left a VRBO house that my in-laws rented outside of Glacier National Park and traveled west.

We are on our way to Seattle, but we're taking a couple weeks to get there. Our first stop was to a small campground in a town called St. Regis in western Montana. In such small towns, the roads are generally clear — especially mid-morning on a Monday. Hot, though.

We rolled out of bed around 7 a.m., spent some closing moments with family in the VRBO house and set sail. Aside from the diesel fuel to get there, expenses today were incredibly low. We only paid for the campground, which was $31.64 for one night.

That includes the electric hookup, which was nice because we needed to run our air conditioner due to the heat. In fact, that's one of the advantages of camping in a campground — once you pay the nightly fee, it doesn't matter how much water or electricity you use. It's all included in the nightly cost.

Onward toward the toughest-to-spell city in the nation: Coeur d'Alene, Idaho.

This is a special place. We visited Coeur d'Alene in 2015 before we quit our jobs, and I remember ducking into a local coffee shop (Calypsos) for a cup of Joe. We talked about our future plans as early retirees as we walked around Lake Coeur d'Alene, and one of our primary goals was to come right back here after early retirement — the same coffee shop — and talk about how closely we met those original goals.

And, we made it back. It was a special moment! The coffee (for me) and tea (for my wife) totaled $6.16 — a small price to pay to accomplish one of our long-standing goals. We also hit the local Safeway in town and plopped down $32.91 for mainly produce to get us through the next couple of days.

Also, we paid a total RV park fee of $139.32 to stay a total of three nights. We had full hookups at this site, which included electricity, water, and sewer. We were livin' large!

This morning, both my wife and I decided that we love Coeur d'Alene so much that we're going to stay here another three nights and delay our trip west toward Spokane. Spokane is a nice city, but it's tough to beat summer in northern Idaho.

We plunked down another $136.08 to extend our stay here at the campground.

That afternoon, we had lunch with a couple who follow us on YouTube, which is always super enjoyable. Of course, we chose a brewery, Daft Badger, as the sight of our meetup — lunch and brewskies and conversation mid-day on a Wednesday. This experience set us back $40. While our budget doesn't allow us to do this every day, it's nice to get out and do things like that.

And with our YouTube viewers, it's always a unique situation because they know almost everything about us (we're open books), but we know absolutely nothing about them!

Today we took a day-trip out to Spokane, Washington, to hit the gym and drop off my camera for some unfortunate repairs.

Luckily for us, Spokane is about a 30-minute drive west and easily accessible from most places in northern Idaho. It also has the gym that I'm a member of.

Pro tip: If you're full-time travelers like us, find an inexpensive nationwide gym. This way, you can not only work out all over the country, but the gym will probably have shower facilities too that you can use. Our Airstream RV does have a shower, but we always like to use "real" showers whenever possible because they are much bigger. We pay about $22 a month for both my wife and me at Planet Fitness (not including both an initiation fee as well as a yearly fee!).

Oh, about my camera: The diopter stopped working. We'll have to see what this will cost us once the technician takes a look.

We got some ice cream in town to cool off on one of those rare 92-degree days in upstate Idaho at a local ice cream joint called Abi's. If you're wondering, I had a scoop of coffee toffee and a scoop of cookie dough in a waffle cone. My wife tried the mango-cilantro sorbet. Today, that refreshing treat set us back almost $10.

Today, we had to move campsites, but we stayed in the same campground. The move took about an hour in total, but only 15 minutes of running the truck. Not a lot of diesel was burned for our 100-yard trip from site E3 down to E10.

In the afternoon, we threw the bikes on the truck and took a bike ride around the lake and through a bit of the city of Coeur d'Alene. Aside from the diesel we used to get down to the lake spot, we spent absolutely zero dollars on our bike trip. Along the way, we got to observe families enjoying their vacations by the water. Magical!

On the way back, we stopped by the grocery store and dropped a little over $163 on groceries for the next week and a half. As full-time travelers, we are at the mercy of whatever we can find at the time (and as a result, pay the price for those things). While this shop wasn't too bad, some smaller towns charge double for fresh produce.

Later, we enjoyed a happy hour in town, which included a couple drinks for both of us, a salad and a bowl of fresh clams for $68.19, with tip. We don't do this too often, but when we do, we like to do it right. Happy hour ensures delicious food and beverages and a nice date night, all for reduced prices. Can't beat that!

Naturally, we started the day by going to the gym.

And, it's the weekend! We generally don't enjoy going out on the weekends because, well, that's when everybody else is out as well. But, we needed a few essential supplies, like filling up our diesel truck with more fuel and, of course, a stop at the liquor store.

We were almost on empty in the truck, so it took a whopping $107 in gas. It's a 35-gallon tank, so when it's almost empty, it's a high-priced feeding for the truck. Luckily, the Costco in Coeur d'Alene had diesel, so we were able to get it for $3.26 a gallon.

After dropping by the liquor store, we headed straight to the lake to cool off on yet another day in the low 90s. The average high temperature in this area is in the mid 80s, and it's been easily hotter than that this entire week. A couple of hours swimming in the lake and chillin' on the beach, and we were out exactly zero dollars. Free fun. And, lots of it. Since it was a weekend, the beach was packed with tourists doing the same thing.

We skipped the gym today. Instead, we enjoyed more time in the city on our last day in northern Idaho for a while. We did fill up one of our propane tanks, which set us back a little less than $20. Not bad for nearly a month of use! We use propane for cooking, heating, and running our fridge when we are not hooked up to electric.

Then, I had to get one more cup of cold brew (and my wife a tea) at Calypsos — you know, for old time sake. That was $9.53 well spent. To round out the evening before dinner, we sat on some rocks right before sunset and enjoyed one last view of the lake before heading back to our campsite to whip up some shrimp tacos for dinner.