There's a fantastic virtual reality training program out there called Zwift. It's changed the world of indoor biking and running. There's another popular social media program called Strava, where athletes of all types can be logged and shared with friends.
The Sioux Falls Parks and Recreation Department has a fun way to explore the city this year. It's the "80 in 18" contest. You can win prizes by visiting certain parks and taking your picture. There are new parks each month.