Depending on how far you want to ride, some good options heading West out by Union area ( see the Udder Century routes posted for ideas ).
Another option is to head North up to Hebron area, and from there you can loop up to and around Lake Geneva ( start early though, as traffic around the lake on weekends gets busy around 10-11 with boaters ). Alternatively, you can head S/W from Hebron along Rose Farm road and back through Union.
See this activity: https://www.strava.com/activities/375152826
( Start/Finish is at Wheel Werks in Crystal Lake, right by the train station ). Riding up to Lake Geneva and twice around is ~105 miles. If you go once around the lake, you'll have about ~85 miles. There are several places around Lake Geneva to get fluids/nutrition.
Proud member of the Felt yakuza.