If it's acorn squash, then Northern Autumn gave you a great cooking idea. You can also add chopped tart apple to the hollowed part of the acorn squash while it's cooking. Very tasty.
If it's yellow acorn squash, just wash and slice or chunk and steam or microwave for a few minutes and drizzle butter on 'em. Or cut in thick slices, layer in a casserole with seasoned bread crumbs, some 1/2 and 1/2 or whole milkand your favorite cheese and bake.
I like the patty pan squash cause you can hollow them out and fill them with various meats or lentils.