Where to stay: Look for beachfront hotels in this Pacific Coast town, like the Copacabana Beach Hotel pictured here, a fun resort usually full of other young people looking for a good time.
Where to party: Nisha is one of the city's newest — and most popular — upscale nightclubs; Baby'O is a tried-and-true favorite, but Palladium is known worldwide for its wild all-nighters and visits from renowned DJs.
What to pack: Laid-back clothing for day and night (flat sandals are fine in the evening, but for the nicer nightclubs, dress up!) and stomach meds, in case you encounter food you're not used to or accidentally drink the tap water (not recommended!).
When to go: April and May or October and November for temps in the high 80s and other fun visitors to party with (during the off-season, the clubs and party scene tend to thin out).