The Age of Discovery

This year, I wanted to hike a leg of the Wonderland trail to celebrate turning 40. Then I got a 9-to-5 job, and have been spending time working and commuting instead of training. I'd still like to do a hike in September for my birthday; I'm thinking of scaling back to an easy weekend backpacking trip, and then take a day off work to rest my feet. :) Can anyone recommend a good hike at that difficulty level, where I still stand a chance of getting a campsite permit?