Hi Canadian,
If you're after a longer route, one of my favourites is from a village called Threlkeld (about 15 miles north of Ambleside), then south along the Helvellyn ridge to the summit of Fairfield, then down the eastern half of the Fairfield horseshoe that Stolly described above (and so ending in Ambleside). This is one for a clear day - once you've climbed Clough Head at the northern end of the ridge you don't get below 500m until the very end; if it's cloudy navigation can be tricky. It also passes over the summit of Helvellyn, which can fairly be described as a 'classic peak' - not as impressive as some of the hills in Canada, but it's about as high as they get in England!
I'm sure you'll end up doing this anyway, but if you're in Ambleside you've got to go up the Great Langdale valley and explore the fells there - Crinkle Crags and Bowfell is as fine a ridge walk as you'll find in Britain.
Have fun - you're in for a treat!