Where to go in Costa Rica?

Hi all—

I’m looking to possibly travel to Costa Rica with my mom. I’ve already been — the Manuel Antonio area. I would like to go to a different part of the country. I’m looking for a beach area, but I would also like access to natural landmarks.

I’ve looked at Tamarindo, but I’ve read that it can have a lot of tourists.

I’ve also looked at La Fortuna and Arenal, but I’m not sure if it is realistic to get to them from a beach area.

Any recommendations for good beaches with access to natural landmarks?