The minute I stepped aboard a MacG 26 S I decided it was lightweight for the job of heavy seas. My friend and I took one on the ocean for 50 miles from Fire Island Inlet to NYC nonetheless (some 50 nm along the Atlantic coast). I have seen people recommend this type of boat for cruising the Bahamas which is 'outside' and blue water on various forums. It can be done but is it safe or well advised?
Then there is this young Hungarian guy who has sailed his 22' boat out of the Med to the South Pacific. Sailing Alone Around the World with Carina (19 ft boat)
I ask you whether you are up to the task on a limited boat?
You could try it on a Sunfish and likely not make it but the QM III as Sway suggested would most likely get you there without half of the headaches.
Otherwise we take my Tartan 27'.