WUB is on an extended distribution hiatus so...
Take your pick: lakes, streams, hills, forests, trails, fish, game, snow sports, ice or whatever it is that helps you get that bit of fresh air in your lungs.
Seasonal programs and equipment like snowshoes, cross-country packages, camping gear, ice augers, even FAT tire bikes for rent from BSU's Outdoor Program Center (OPC).
Nice Ride Bemidji offers flat fee by the hour, day or week for bicyles to anyone over 18, age 16-17 with a parent. These orange bikes are available at various locations, including the state park. If you have your own bike and it needs some simple fixing, check out the repair station in front of the public library.