The Yucatán Peninsula has seen a recent explosion of companies that organize nature and adventure tours. One well-established outfit with a great track record is Ecoturismo Yucatán, Calle 3 no. 235, Col. Pensiones, 97219 Mérida (tel. 999/920-2772; fax 999/925-9047; www.ecoyuc.com). Alfonso and Roberta Escobedo create itineraries to meet just about any special or general interest you may have for going to the Yucatán or southern Mexico. Alfonso has been creating adventure and nature tours for more than a dozen years. Specialties include archaeology, birding, natural history, and kayaking. The company also offers day trips that explore contemporary Maya culture and life in villages in the Yucatán. Package and customized tours are available.