Last year we stayed in San Pedro for 2 weeks during the time there we flew Tropic to the muni where I had rented a small 4x4 suv from Avis on line a couple of months prior ( it was waiting for us on our arrival). We drove to San Ignacio touring and stopping along the way (be sure to stop at Orange gift shop you can't miss it) we stayed at Martha's guest house. We toured through Spanish Lookout and surrounding area ruins then returned to Altun Ha and back to the muni and returned to SP with no safety issues. The rental contract is very straight forward you are not allowed to take the car outside of Belize. Lots of tours in SI to take you to Guat.