Travel Research:
 
Google Earth: Take a virtual pre-run, all the way to Tikal
Expedition Portal: Active vehicle-dependent travel community
Center for Disease Control and Prevention: Necessary research for immunizations, etc.
U.S. State Department: Should be balanced with reports on the ground
 
 
 
 
 
 
 
 
 
 
 
Usefull Links:

Mexico

Hacienda De Los Santos, Alamos
Costa de Cocos, Xcalak, Yucatan
Belize
 
Guatemala
 
El Salvador  
   
Honduras  
   
Nicaragua  
   
   
Costa Rica  
Rafiki Safari Lodge  
   
Panama