This link - Route of the Hiawatha - will take you to a site that details a 15 mile bike trail along the old rail route of the Great Northern. The trail passes through many tunnels - one over 8,000' long - several trestles - one over 700' long and 200' high - through some of the most beautiful scenery in the northwest. Be sure to check out the photo album.
This is something I've been wanting to do for several years and this might be the year I do it! We're thinking of going up in September when the weather cools just a bit.
Anyone ever done this? How about you Ken Fitzgerald? Been there? Want to?