I have the 212CC and easy ramps to launch out of are:
Saquatucket in Harwich to fish Monomoy and Nantucket Sound, $8 fee and its an easy ride out to the area unless there are strong SW winds then it is sporting.
Green Pond, ditto what Bob says watch the drop at the end of the ramp it has ruined more than one trailer. Short ride to Vineyard Sound.
There is a new ramp in Falmouth off road next to Eastman's plenty of parking ramp is new and nice, plenty of parking for trailers. Have only been there on weekdays and it wasn't crowded. Shorter ride to Vineyard Sound.
I personally didn't like the Great River Ramp since there is no dock to tie up to while you get your trailer and vehicle. Child River is ok but a slightly longer run on the river before your in the Sound.
Take Ray's advice and fish the South shore if no luck there try Hedge fence and off State beach for Bonito and Albies also. Then there is also middle ground to try for Blues and Stripers this time of year. Get Eldridges Book to figure the tides running on the rips makes all the differance.
SW winds on the south side make it more of a challenge than the bay when there is a strong blow.
Kevin.