A nice low level walk in Glencoe is the Lairig Gartain and Lairig Eilde round, if it's the kind of day you don't want to go up high.
The Walk Highlands website is a very good resource for walking in Scotland. If you click on the walks section then look at the various places you will be visiting, you will find route descriptions of all kinds of walks, from easy strolls to big mountain days. That is always my first port of call when planning holidays.