More of a climb than a hike, but I did enjoy doing Longs Peak in Colorado last September as an overnighter. Pretty interesting tarping it at 12,760 feet. The weather (although cold and windy) was pretty good and not very many on the trail. I was at the summit alone for some time.

As for a longer hike, I would recommend the Rockwall in British Columbia. Some pretty amazing views over a five day hike.