Many hotels rent windsurfers to their guests, but if yours doesn't have a watersports concession stand, head for Key Biscayne.

Sailboards Miami, Rickenbacker Causeway, Key Biscayne (tel. 305/361-SAIL), operates out of big yellow trucks on Hobie Beach, the most popular windsurfing spot in the city. For those who've never ridden a board but want to try it, they offer a 2-hour lesson for $69 that's guaranteed to turn you into a wave warrior or you get your money back. After that, you can rent a board for $26 an hour or $38 for 2 hours. If you want to make a day of it, a 10-hour prepaid card costs $150. These cards require you to prepay, but they also reduce the price by about $70 for the day. You can use the card all year, until the time on it runs out. Open daily from 10am to 5:30pm. Make your first right after the tollbooth (at the beginning of the causeway--you can't miss it) to find the outfitters.