As many other reviewers have mentioned, having a guide take you through Manual Antonio is definitely the way to go. The walk from the park entrance to the beach really isn't long at all. If you were to go by yourself, you'd walk along a gravel road, maybe see a couple of animals if you were really looking, and then end up on a beautiful beach. With Edgar as our guide, however, we saw many, many animals. He was really dedicated to making sure that we saw as many interesting creatures as possible, and we did! We saw two types of sloths, three types of monkeys, and many different birds, insects, and bats. Edgar used his scope and our phones to take some fantastic photos that we couldn't have captured at all otherwise. We ended the tour with cookies, fresh pineapple, and juice and then said goodbye to Edgar and spent some time playing on the beach and in the water. It's a busy beach, but a very nice one. It's easy to take photos of white-faced monkeys from the beach because, unfortunately, they've been quite desensitized to humans and come to the trees on the beach looking for food.
We emailed firstname.lastname@example.org at 8:30 the night before and got a response back right away. We met Edgar at El Avion restaurant (an easy landmark to find) and he hopped in the car and helped us to get to the best parking location. Note that there are numerous people wearing official-looking orange or yellow vests trying to flag down cars and direct them to parking our tours, but Edgar helped us to bypass all of them and get to a very close, safe parking area. If we'd been alone and stopped at the first official-looking orange vest, we would have had a long, uphill walk to the park entrance.