When you’re out and about, it’s a good idea to carry toilet paper or handi wipes with you as these are often in short supply in public bathrooms. You may also want to carry disposable paper seat covers.
It’s a good idea to carry a small bottle of drinking water, especially if you’re coming from a colder climate. The warm climate of Cuba feels wonderful, but don’t forget: your body is not adapted to it if you’re flying in from a winter clime, and you could dehydrate quickly.
When out and about in the city, your hotel registration card and/or photocopy of passport is sufficient for identification; you don’t need to carry your passport.
It’s also best to carry only what money you’ll need for the day. Other funds, important documents, drivers’ license, flight tickets, etc. can be locked in your suitcases or in the small wall safes that are available, at a modest cost, in many hotel rooms.