+1 on that site. Good level of detail, points of interest, & routability. Best of all it's FREE, just like this thread title states.
Originally Posted by GPSTravelMaps.com
Central America has some amazing back road tours. Many of them have been included in the mapsets by GPSTravelmaps.com
There are three distinct sets that you can get from them depending on the length of your trip.
Central America North
Central America South
There are also maps for Peru and the Caribbean as well.