Road Cycling Around Devil's Lake State Park
While there are no dedicated road cycling trails in the Park, slow speed limits and rolling terrain makes for great cycling routes. Outside Park boundaries, cyclists can find a wide network of quiet country roads to explore. Look here for route ideas.
If you're looking for an easy, scenic ride, consider the riding around the North Shore or South Shore areas of Devil's Lake, where traffic is generally slow and there's lots to see and do. Unfortunately, there is no trail going around the Devil's Lake itself, and trying to do a loop on the road is fairly strenuous for the casual rider. Those with their own bikes might also consider riding along the Baraboo River in Baraboo, or checking out the lovely downtown area.
Devil's Lake does not rent bicycles of any kind, but Mirror Lake State Park has a limited number of cruisers available for rent and use at Mirror Lake State Park. The Reedsburg Chamber of Commerce rents hybrid bicycles at the beginning of the 400 State Trail in downtown Reedsburg (about 30 minutes from Devil's Lake State Park).
If you are looking to rent a good bike or just need good info on local rides, visit Wildside off Hwy. 12 in Baraboo. Wildside is the only real outdoor store in the Baraboo area, and they specialize in biking sales, equipment, and repair. Wildside rents both 54 & 56 centimeter carbon frames available for demo at $50/day. Their inventory changes as bikes are ridden and sold, so brands and models depends on their stock and the season.
Mountain Biking in the Devil's Lake State Park Area
Off-road trail systems in the greater Devil's Lake/Baraboo area are very limited. Trail riding is available on the Upland Trail (8 miles) at Devils Lake State Park and at Mirror Lake State Park (9 miles of ridable trails), but terrain is limited to double track fire roads in both parks (which serve as nordic ski trails during winter months). These wide, gravel roads can provide a decent workout or a fun 1-2 hour family ride, but they won't satisfy anyone looking for interesting, challenging single track mountain biking.
More serious/skilled riders will want to check out Devils Head Resort, which maintains a single track trail system open to public use for $7.00/day (or $75.00/season). When the trail system is well maintained (some years are better than others), it is pretty awesome single track. Bike-less riders may rent a mountain bike at Devil's Head for $20/day, and riders who would rather not grind out the uphill climbs can purchase a lift pass for $30/day (Saturdays in July and August only). Trails open daily from 8 AM to dusk.
Outside the above options, look to places further south like Blue Mound State Park, CamRock 3, or the Emma Carlin or John Muir trail systems in Kettle Moraine for good riding. We're hopeful that the new Sauk Prairie Recreation Area will have mountain biking in the coming years, but they are still building their Master Plan and nothing will be decided real soon.