Hi! We are off to Costa Rica in the summer to see nesting turtles. We would like to visit Ostional as part of the trip to see the Olive Ridleys nesting. I have a choice of late July or Late August--both are at the last quarter of the full moon. Is there any preference? Is it a big difference? I thought of staying at Hotel Punta Islita for a few nights and driving to Ostional as a side trip--is this doable? Does it have to be at night? Thanks!!