See more of Catemaco
Catemaco.info is a wonderful website about Catemaco with hundreds of photos and complete descriptions of all its touristic features.
Lancha tour
Take a boat spanish: "lancha" tour over the Laguna de Catemaco and see monkeys. They offer one-person and group prices.
Ecobiosfera
Do one of the tours in the great rain forest nearby. There are different kinds of tours, some require heavy preparation, some are just in a 4x4. For example, you can take a bird watch tour or make a half-day walking tour in Sontecomapan. They also offer some longer-lasting activities. For example they offer courses for identification of special tropical birds. To make sure that you'll really come, you have to pay a deposit half of the price.
Reserva Ecológica Nanciyaga
Here, in the jungle, you can take some nice activites: Do a walking tour over a hanging bridge which crosses a fresh water spring. You also can make some natural mud masks and spiritual cleanings. In the restaurant the typical food out of the Tuxtla region is served. And, if you don't decide to stay in one of their cabins, you can make a tour with some kayaks and watch the nearby nature.