Just an update after spending the past 10 days in Manuel Antonio.
Their are only 3 trails open. The trail from the entrance to the beach, the trail between Playa Manuel Antonio and Playa Espadilla Sur and the Punta Catedral lookout trail. hese are the 3 most basic trails in the park.
The main trails that lead to the other beaches and the trails that lead deeper into the park are all closed and look like they will be for a while. That's really cuts out a lot of wildlife viewing opportunities. Yeah, you can (will) still see the monkeys, a few sloths etc, but it's definitely not as good as having all trails open.
Honestly, it was disappointing since it restricted people to only about 25% of the park.
I understand the trail maintenance is necessary but they didn't advertise that all those trails were closed. You find that out after you buy a ticket and go into the park.
I wouldn't let it change your plans, but be aware of it!