You can get quotes from the Moorings website (and look at the different options for boats) quite easily (and it's fun!). For 4 people for 6 days we spent about 500$ on food (we provisioned ourselves) and some (

) of that was beer (though we did need to get more beer later...). IMO the trickier parts may be the stuff that's not as directly "sailing": provisioning (if you do it yourself), picking up a mooring, figuring if you can get from A to B before dark.
Go for it and have fun!
__________________

"... the only matter of consequence before me is what I will do with my alloted time. I can remain on shore, paralyzed with fear, or I can raise my sails and dip and soar in the breeze." -
Richard Bode,
First you have to row a little boat (pg. 94)