Isla Tortuga is actually two uninhabited islands, just offshore from Refugio Nacional de Vida Silvestre Curú. This stunner – a quintessential tropical paradise – is widely regarded as the most beautiful island in Costa Rica. The pure white sand feels like baby powder; gargantuan coconut palms tower overhead; and clear turquoise waters lap up on the shores. Snorkelers usually enjoy good visibility and a wide variety of sea life, although there is no reef here. Jet Skis and kayaks are sometimes on offer, depending on your tour.
Unfortunately, Tortuga receives heavy boat traffic from tour operators from Montezuma and Jacó, and the crowds quickly detract from the magic of this place. If possible, avoid weekends and holidays. Even better, avoid high season.