I am planning to travel to Guatemala in April with a friend. We were planning on renting a car in Guatemala City and traveling to Antigua, Lake Atitlan, Chi Chi and other towns in the highlands. I am somewhat concerned, however, about safety issues and have read that there have been quite a bit of car-jackings and robberies on the roads in Guatemala. Could somebody please advise me if it is safe to rent a car or if we are better off traveling by bus or shuttle? I would rather avoid the inconvenience of taking a bus, but safety is my first concern.