There are a great number of activities at Peninsula State Park and I think the Sunset Bike route is a good choice for novice and intermediate riders. The Sunset route is 9.6 mile ride and plenty of places to stop and snack. I would allow 3-4 hours to do the loop and have lunch at Nicolet beach.
We generally start about 9:00am from Baileys Harbor and hit Nor Door rental in Sister Creek about 9:15 am. Bike rentals start at $6 per hour and full day rentals starting at $25. We get our bicycle and helmet fit by size, provide a credit card for deposit and we are out the door. From Nor Door we quickly cross Route 42 and we are in “Julies Park Café & Motel” parking lot and then through the gates of Peninsula State park. There is no cost or pass needed to enter the park since we are biking in.
You can rent bikes and kayaks at Nicolet Beach Concessions but you will need a Wisconsin State Park parking pass (daily or annual). The Sunset route is a mix of crushed stone, dirt and pavement. The loop goes near Green Bay lake shore and through cedar and maple forests, past camp grounds and Nicolet Beach. The beach is a little more than half way. It’s a great place to break for an early lunch. There are plenty of picnic tables, bathrooms and view of the lake and Horseshoe Island. The second half of the trail has some exciting downhill areas and you ride past the Peninsula Players theater.
Afterwards we return the bikes to Nor Door and head to Sister Bay to do a little shopping and then hit Wood Market for some fresh corn on the cob and head back to Baileys Harbor to get cleaned up and plan out our afternoon. Perhaps a hike through Tofts park, swimming in the pool or off to do a little shopping before dinner.