Rock Hall was my choice and many of the sailors I know drive in from Wilmington. Suggest you take a look at The Sailing Emporium for a kid friendly, lovely landscaped, swimming pool, clean bathhouse and work on your own boat facility. Owner Art Willis would be please to hear from you.
There's plenty of other options in Rock Hall but from your list of desires I think TSE best fits your needs.
Catalina 387 #29
Rock Hall, MD