We almost ditched the brand-new 2.3 meter dinghy that came with the boat, because there's no way we can safely take four in it, but the small size is a real benefit for the kids who find it perfectly manageable on their own. I'm thinking of supplementing it with an inflatable kayak, if we can find a place to store it aboard, so that we don't have to ferry the family to docks and landings.
Jim, consider a Portabote. They fold down to wakeboard size and can be lashed to the lifelines. The seats and the oars are a pain to stow, but they are light and can conceivably go down a cockpit locker right into the "dead zone" at the transom.
They row well and are dry. If you want a motor, you can stash a Honda 2 HP four-stroke (28 lbs) anywhere and I've had that combo out in near 20 knots...wobbly but serviceable and a good three point five knots into the waves and wind. Seats four.