We hired a car to take us because we were still recovering from a bad food poisoning incident. If you take a bus, you have to walk probably 2-3km from the road to get to the beach.
Having a car/driver for a day only cost us $20 and it was worth it, as he drove use to Agua Blanca afterward.
The park closes at 4pm!
Beautiful beach, very clean. There's a simple snack bar (no alcohol allowed) about 100 meters from the beach if you need anything.
We rented an umbrella for $4, which was a good call. There's not really anywhere to get shade.
Beautiful place! Definitely recommended. Pack a picnic, towel, and plenty of sun protection!