Fort William is a good base, as it is surrounded by hills, and a relatively short drive from many other hill areas like Glen Coe, Knoydart, Ardnamurchan, Loch Ness, even Skye is a day trip. There is an excellent place, the Linnhe Lochside Holiday Park , which has lots of accommodation and beautiful views up Loch Eil, try this link;
http://www.linnhe-lochside-holidays.co.uk