If you're interested in booking some court time on Kauai, there are public tennis courts in Waimea, Kekaha, Hanapepe, Koloa, Kalaheo, Puhi, Lihue, Wailua Homesteads, Wailua Houselots, and Kapaa New Park.
For specific directions or more information, call the County of Kauai Parks and Recreation Office (808/241-4463). Many hotels and resorts have tennis courts on property; even if you're not staying there, you can still rent court time. Rates range from $10 to $15 per person per hour. On the South Side, try the Grand Hyatt KauaI (808/742-1234) and Kiahuna Swim and Tennis Club (808/742-9533). On the North Shore, try the Princeville Racquet Club (808/826-1230).