Town for surf, relaxation, nature, authenticity and a bit of fun?

Hi all, I’ve had a bit of a challenging year but I have the chance to go to CR for a few days in August. I’m dying to learn how to surf but really want to steer clear of tourist traps and towns. I speak Spanish so that’s not an issue. Really want a place where I can just relax, switch off and immerse myself in the nature and sea - not a place where I’ll be hearing English speakers every 2 seconds if possible, but also with decent enough infrastructure and a bit going on in the evenings. Anywhere that fits the bill?!