You can't ride your ATV on a street or public highway, except to cross from one side to the other. You cannot cross Interstates except at an overpass. You must have a valid driver's license to do so.
Check out these Howard, SD ATV/OHV resources:
Canoeing, kayaking, and paddleboarding opportunities near you
Your local trail guide for all ages and skill levels
Local fishing holes, gear advice, and retailers
Discover local campsites, helpful hints, and where to buy gear
Education, permits, regulations and where to hunt in your area
Local archery ranges, tips for beginners, and advice on the proper gear
Get started right with local safety education, training, ranges and retailers
Off-road riding in your area, plus instruction, rentals and dealers