Like others have said, it's a personal thing. I use a 3mm for the Bahamas (similar water temps). I always suggest having a separate hooded vest, as it's something that you can add over top for extra warmth.
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No the wetsuit has no hood. It has soft neoprene at the the neck, wrists, and ankles that provide a level of seal and limit flushing. It also has a large back flap that prevents water ingress from the zip to you.I dont understand your setup. You have a hooded vest AND a semiddry? A semidry wetsuit means built in hood and flaps under the zipper..... You wear two hoods?