Yes, it's still possible for Americans to travel to Cuba, although the US government recently made it a little more difficult for individual tourists. You can read about how to apply for a Cuban visa here.
November is the start of dry season in Havana, meaning you'll get plenty of sunshine and clear skies as you explore this newly accessible hotspot. Some of the most popular sites for visitors include the seaside El Malecón boulevard, the picturesque Old Havana district, and the stunning architecture of Plaza de la Catedral.
Make sure you travel responsibly by visiting lesser-traveled areas and national parks, donating money and items to institutions in need, and tipping in Cuban convertible pesos whenever possible. You can read more about responsible travel to Cuba here.