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There are many travel agencies in Flores that can book a shuttle, with (Q100) or without (Q80 return ticket) guide for you. Entrance for Tikal (Q150 regular, Q250 for sunrise) is typically charged separately in Tikal. If you book through Los Amigos be aware that you have to share your guide with about 20 more people. Busses leave Flores at 03:00, 04:30, 6:00, 08:00, 10:00 and 12:00, and return 11:00, 12:30, 13:00, 15:00, 16:00 and 18:45. It takes about 1.5 hr to get there. There are vendors for food and drinks at the site. It can get really hot from 10:00 so make sure to go there early.
La Cueva de la Serpiente, the cave of the serpent
Inside the cave are many formations that resemble various objects, such as animals, people, and of course ordinary stalagmites and stalactites. Most of the relics are labeled (in Spanish) and will be identified by your guide.
A small zoo that is home to monkeys, jaguars and raccoons as well as some animals rescued by ARCAS. The zoo is a 10-minute boat ride from Flores (inquire behind Hotel Santana).
El Mirador de Kan Ek
Large overgrown Maya ruin a stone's throw from Flores, on the San Miguel peninsula just across the lake about 250 m distant. Easiest way to get there is by boat. Haggle with the lancheros, who will want to take you on a full (more expensive) tour of various sights. If archaeology is your thing, insist on only seeing the Tayasal ruins, and that the lanchero guide you to the major pyramids (all overgrown) - otherwise you might miss them on the forest trails. The first pyramid, known as the Mirador ("viewpoint"), is a 5-minute walk from the lakeshore, with concrete steps up the side to reach the top, where a wooden tower has been built to give fantastic views across the lake. There is another large pyramid nearby, and the main plaza has a couple of badly damaged stelae, and a smaller pyramid.