Because of the heat in this area, we've made it a point to stay out of the sun from 12 to 2 each day. Tamarindo is crazy hot and walking out of an air conditioned place into the afternoon sun is like walking into an oven. If you're out and about at an earlier time and stay outdoors (preferably in the shade unless you like to punish yourself) it's not so bad. Just like the boiled frog parable, if you slowly roast yourself you won't realize how hot it is as the day wears on but if you jump into a boiling pot (or the rolling heat in this case) you'll quickly realize how much folly it is.
That being said, the few times we have braved the elements at a neighboring beach club called the Langosta Beach Club and it's about 2 blocks from our condo. It's owned by a French company and everyone there seems to speak French, English and Spanish. They have a nice little pool, beach loungers, a few hammocks and one of the nicest stretches of beach (at least in my mind) right in front of the place. They also have a little bar and restaurant in the pool area and serve great food at somewhat reasonable (at least for this area) prices. Their bacon and avocado sandwich is quite delicious. Smoothies aren't the cheapest we've seen but their strawberry one is heavenly on a warm day.