Go long interest?

I am thinking of putting together an 'adventure ride' from Green Lane Park into Philly using the Perkiomen Trail and linking into the Schukyll River Trail. I figure it would be near 100 miles of riding, but its flat, no cars, and we could grab lunch in Manyunk as a nice break. It could be done on MTB, cross, or road bike (probably would want fattish tires) and could be an all-day adventure. Anyone game?