st lucia is pretty sweet this time of year. good winds usually the trade have filled in. some sweet bars that are rocking, not massive clubs. laid back, few bands, odd dj nights etc.
kitespot is close to everything, but you need to rent a car.
this is the north of st lucia. you can find pretty decent well priced accomodation. www.kitesurfingstlucia.com
has gear rentals and pics of the spot on the website.
The south of st lucia has good kiting too but not as much to do in the partying department, so i reckon up north best for this kind a trip.