Jekyll has nice beaches but St. Simons has waay more to offer as far as rentals, dining and shopping etc. Our beaches are pretty nice too
The King and Prince resort is here on the beach and they have 2 private clay courts. Give me a ring if you want some more info on other choices: nine one 2, 2 four eight, eight two 41.
Plenty of options depending on your budget, Sea Island has two facilities with all clay as well (Murph Jensen is the pro for Sea Island, but I don't know if he is doing WTT).