Re: Too big for a sunfish?
The sunfish would be fine... but if I might recommend... start with a laser (a beat up one is fine). The sail controls are a little more "real." The boat is faster.
If you want to sit IN not ON... move up to a Precision 15, Capri 14.2, or Lido (tons others I can't think of right now)..
But NO there is nothing wrong with a sunfish, and they are pretty substantial board boats. A superfish or a force 5 works as well (or phantom).
Hull #68 S2 7.9 on our little landlocked puddle, Lake Wallenpaupack, PA, it's cheap, trailerable, and paid for.