There are a few timeshares in AC, but they're not that great. I stayed at Fairfield - the elevator was HONESTLY a huge, huge annoyance - sometimes a 15 - 20 minute wait! But the room was nice and kind of ocean view (partial). TUG rates it 6.52.
Fantasea is 6.27, Flagship 6.45.
So none are great. That said - they will do for the kids. I'd stay there for a birthday getaway such as you're suggesting. Teenagers find the area fun - BUT - I would not let my teenagers wander the boardwalk alone. It's not safe there. Good luck!