If you want to try a fun trail, try the Omaha Trail between Elroy, Wi and Camp Douglas. Located on an old railroad line it passes through a tunnel and by some neat rock formations.
Even on a very hot and humid day it is so great to see people using the trail. The breeze and the view on the bridge is worth the effort.
It doesn’t matter if you’re not an avid bike rider you can walk or take a leisurely ride on the short Flyway Trail. Park at the Buffalo Town Park or at the Latsch Island Park and go. It’s fun to cross over the railroad bridge.