I'm looking to do my first solo backpacking trip. I normally average about 13 miles/day with my fiancee, but we've done up to 18. I like to keep it low mileage for her so I don't make her hate life when a walk in the woods is "supposed" to be calm enjoyable. That being said, I truly love marathon experiences and testing my physical limits. I'd like to find a 50 mile loop where I can do 20 miles the first day, 20 miles the 2nd day and 10 miles the last day. Obviously the mileage doesn't have to be exact. I live in Philadelphia, so within a 7 hour drive would be ideal. Some similar loops we've done are below but I'd like something new. I was thinking about a loop on George Washing national Forest (I believe there's a 70 mile loop, but tough to shorten). I'd love to tie in some time on the AT, but it isn't necessary.
Any other suggestions?
Black Forest Trail in PA - This would have been perfect, but we've already done it.
Presi Traverse - 4 days - We averaged 1 mph while bouldering from Madison to Washington, obviously couldn't accomplish that distance
Shenandoah - Multiple 4 day loops
Smokies - 4 day loop
Long Trail - 4 day point to point
WV to North of Harpers Ferry - 4 day point to point on the AT