We went from San Ignacio, BZ to Tikal a couple of years ago. We went with a small tour (about 8 people). After we crossed the border into Guatamala we hooked up with 5 Guatamalan soldiers who escorted us in their truck the rest of the way to Tikal and then back to the border. We didn't have any problems, but we could sure tell they were definitaly concerned about "bandits". I felt more comfortable with the soldiers accompanying us. By the way, Tikal is fabulous! Amazing! I'm glad we made the trip.
Anita