So perhaps you're not exactly getting endorsements for your surfing career yet. In fact, maybe you're even not entirely sure you know which part of the board should point where. No fear; even surfers so wet behind the ears they're actually just swimming can find a safe, comfortable place to practice in Costa Rica.
One beach, Tamarindo on the Northwest Pacific Coast, might be a particularly good bet if you're looking for your first surfing experience or if you just aren't yet confident about your surfing skills. It's a fairly touristy beach, which means that decent breaks (that is, waves) will be within walking distance from hotels and restaurants. It also means there are plenty of surf shops and schools crowding the area to give you lessons, or rent you equipment.
Playa Jaco and Playa Hermosa are both Central Pacific coastal beaches near each other that are also good for beginning surfers. In popular tourist areas, there'll be plenty of people on both beaches that can give you an idea where surfing rookies are safe to practice.