Just south of the city center on Avenida Balmaceda is Playa Cavancha, a long stretch of white, sandy beach that's great for families and often crowded. You can stroll along the boardwalk and touch the llamas and alpacas at the petting zoo. There's also a walk-through aquarium housing a group of yacares, small crocodiles that inhabit the rivers of Bolivia, Argentina, and Uruguay. Amenities: food and drink; toilets; showers. Best for: partiers; surfing; swimming.