We're planning our first trip to Costa Rica in August 2010 for four adults. We'd like to see as much wildlife as possible and do some snorkeling, diving and possibly getting our son SCUBA certified as well. We'd really like to avoid crowded and touristy areas. With that in mind, we're considering dividing our time between the southern Osa Peninsula and the southern Caribbean coast. Renting a vehicle seems to be the best option as we'll be there 12-14 days and would like to see as much as we can. Considering the distance between the Osa Peninsula and, let's say, Cahuita, should we plan on staying overnight somewhere in between? Is a 3 or 4 day stay in Osa long enough, or should we plan for more? What areas of the Caribbean coast should we be focusing on for a low-key environment and proximity to nice quiet beaches? Any advise, comments and suggestions are welcome!