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Good to know, now I'm definitely skipping Costa Rica :)
I've been to CR a couple of times the past few years and the beach breaks are great and people are super nice. I've never experienced any hostility in the water there, or elsewhere in the world either for that matter. Being considerate of other surfers goes a long way and should someone act like an ass just move a couple of 100m up or down the beach. There is always another ok break close by.
That's true. I still like playa grande.