The boat ramp is to the far left as you walk out the main entrance to MGM. Here is the park map, you can see the little boat ramp in the water.
http://www.allearsnet.com/tp/mgm/mgmmap1.jpg
Once on this boat it will take you to Epcot. It takes about 15 minutes to get over to Epcot. But will first stop at SWAN/Dolphin, then on to Beach Club/Yacht Club, and then on to Boardwalk Inn/Villas, and then on to Epcot. So you can get off on any one of these stops and go into the restaurants. Since you are on the plan, you will want to skip the Swan/Dolphin since their restaurants are not on the plan. But the ones on the Boardwalk AREA are:
Beach Club hotel:
Cape May Cafe Buffet (this is a seafood buffet and it gets high marks on the boards)
Beaches and Cream (50's soda shop, mostly burgers and milkshakes)
Yacht Club hotel: Yachtmans Steakhouse (2 credits on the
DDP) Nice steak place
Boardwalk Inn/Villas:
ESPN
Spoodles (also gets good reviews)
Big River Grille (we did not like this restaurant at all)
Or of course if you weren't planning on returning to MGM for Fantasmic you can hop the boat all the way to Epcot and eat in one of the countries and then watch illuminations! (that is if you have hopping priviledges on your tickets of course!)
Happy Planning