Starting from where you rent bikes, over to the main public areas of FW is just over 3/4 of a mile. Over to FW, around the main car loop and home is about a 2 1/2 mile ride.
We ride to the lodge from the fort whenever we visit because DD likes the chicken tenders at Roaring Forks. It is a nice ride or walk. Very peaceful and the chances of seeing deer and other wildlife is good. If you go late afternoon be careful of storms. We've gotten in a few from there.