Disney Trip of a Lifetime?
2.5 weeks, minimum. 1 week at AKL, a few days at Pop, 1 week at WL.
Parks would be every other day, at most. Lots of time spent at pools, resort hopping, eating good meals, riding the transportation (which we love), and people watching. We would hit the each coast once, do a few things around Orlando...lots of mini golfing and such.
Outside of WDW trip?
Domestic - Amtrak to Seattle, then road trip from Seattle to San Diego. Take a few weeks, see everything.
International - 1 month - England, Scotland, Ireland. Then all of Northern Europe...Scandinavia, Germany, Poland, Netherlands, Luxembourg. Maybe fly to Iceland if enough time. Lots of train travel.