I would support much of the advice given by other contributors to these reviews.
1. Take plenty of sunscreen, insect repellent and toiletries, toilet rolls and plenty of cash (ATMs are few and far between). Also take a padded seat cover to put over your seat and padded shorts. We would also strongly recommend that you take immodium with you.
2. If you enjoy snorkelling, take a snorkel – a number of people in our group regretted not having one when we stopped at a couple of excellent spots for snorkelling.
3. In Guajimico we were offered a trek in the afternoon of our arrival. It is excellent, not a ‘trek’ but a leisurely one and a half hours stroll through the woods along the coast, a swimming opportunity in an idyllic little cove and a visit to some caves where we saw some bats.
4. In Trinidad there is a rest day which gives you the opportunity to have a rest, go on a catamaran trip or cycling in the Valle de los Ingenios. Most went on the catamaran trip (the usual boat trip with bar facilities, lunch and some free time on a beach) but my wife and I cycled in the Valle de los Ingenios – for us it was the best day’s cycling as the valley with the Manaca Iznaga tower is a Unesco World Heritage site and the views were wonderful.
5. At the Havana hotel, the Occidental Miramar, we would recommend the à la carte restaurant El Patio – it was our best meal in Cuba, a little more expensive than other meals but still under 50$ for two.
6. The group tour of Havana at the end of the trip is too short for such a fascinating city. My wife and I booked a two weeks holiday in Cuba – 3 nights in a hotel in old Havana, the 8 nights cycling holiday and 4 nights in an all inclusive hotel beach hotel in Varadero – and would thoroughly recommend it.