It is at the Beach Club resort. Very easy walk from Epcot or you can walk (about a 15 minute walk) from MGM. You can also boat to the Beach Club from either Epcot or MGM.
Its burgers, shakes, fries, sandwiches and ice cream. They have a huge thing called the Kitchen Sink that can feed about 10 people! They don't take ADR's so go at an off time or plan to wait a bit.
It is a table service restaurant, but very casual.