I can get a flight from Manuel Antonio to San José arriving 11:10 a.m. The shuttle then leaves for international airport at 11:15, arriving 20 minutes later. I have a 2:30 p.m. flight home, so time wise, it's perfect, so long as the original flight leaves on time.
Is that crazy, are Nature Air flights dependable enough to do this? The price is cheaper than hiring a driver and not much more than a shuttle, which would also be cutting it close.