I agree with the others about Jupiter, Juno Beach, and throw in Palm Beach Gardens - lived there for 9 years (now just 15 minutes south). Very safe (except for 95 exit ramps...). Tequesta is nice but a little pricey - well, for that matter all 4 towns are pricey. PBG you have lots of golf - home of Jack Nicklaus and PGA National. Beach is 10 minutes East. Wellington has lots going on but not as nice as PBG. And farther from the beach. You should also check out Stuart and Jensen Beach.
Like others have said - you really need to take a week or two and just come down - drive around.
Good advice from all. Is there a way I can bookmark this thread to refer to over time?