Leave your car at the parking in front of the plantation house San Juan and start your hike from there to the South Coast. You need to pay a small entrance fee. San Juan has three bocas or beaches, so you have a choice of trails and you can take a rest to swim.
There are a lot of Manzanilla trees and by now you should know how dangerous they are. Don't touch the leaves, don't eat the apples!
Dolfins!
The trails to the bocas are not hard. But if there is no breeze it can be pretty hot. Especially when you go up hill.