Here is a photo of the heart of Tamarindo beach, taken from a boat leaving on a sunset cruise. The palm trees are part of the grounds of the Tamarindo Diria Resort. The combination of a beautiful beach, an ocean that is part of a national marine park, the amenities and restaurants of the town, and the attractions and activities in the surrounding area combined to cause Tamarindo to be described as Costa Rica's most popular beach town in an article in Forbes Magazine.
As I have mentioned previously, all beaches in Costa Rica are public property, which I think is a good thing. Although resorts may have a beach front location, people can walk for miles along the sandy beaches without having roped off areas at hotels that block access to the beach, as can be encountered in other parts of the world.
There are some small coves or pocket beaches that are located within master planned developments, such as the Four Seasons Papagayo that I showed a couple of weeks ago, that cannot be reached from land unless you have access to the development, but the major beaches are open for people to stroll, take long walks, swim, sun bathe, surf, etc.