Call if you have any questions, and good tennis to you.
In addition to the answer Kim gave you another community to consider is Pace Island. Pace Island is a gated community of about 670 homes near Eagle Harbor and Fleming Island Plantation in Clay County. Pace Island has community tennis teams for players of all experience levels. Even though you mentioned that you don't have kids the community has a summer swim team for kids ages 5-18 that competes with other area communities during June and July each summer. Pace Island has two community pools, nature trails, basketball court, and a community dock on Doctor's Lake. The guard gate is manned 24 /7.
While the community does not have a golf course it is about 2-3 miles from the Eagle Harbor and Fleming Island Plantation golf courses. Both courses are open to the public. I play both frequently and they are great courses.
I live in Pace Island and would be happy to answer any questions you have about it or the other area communities.
Good luck in your search!
Prudential Network Realty
3535 Highway 17, Suite 10
Fleming Island, Fl 32003