The town of Santa Eleana is a short walk over the causeway back to the mainland. It has most shops, businesses, and services you might need. It has several bank branches, a very large typical market, fair grounds, and seems safe. Bottled water is available most everywhere. The airport is about 2 miles south of Santa Eleana.
Cabs are readily available.
Information on Santa Eleana, El Remate, Flores, and Hotels in the Tikal area is available from David or any of his staff. He has several brochures in his lobby on area attractions and can either make arrangements from the hotel or put you in touch with several guides, Spanish language school contacts, or give you directions on most any of the many activities in the area, including birding, swimming, horseback riding, fishing, hiking, archeology, anthropology, ruins, Ruta Maya tours, wood carving, artifact hunting, tropical or medicinal plants, spiders, tarantulas, native fruits and vegetables, and just meeting new friends.