We drove to the Dells a few days ago. Crowds are far smaller than normal this time of year, understandably. We brought a lunch, and ate at Mirror Lake State Park. There is plenty of space to comfortably distance from others. We also stopped in town at Grateful Shed Truckyard for a drink; there is a giant outside seating area, with food trucks inside a large building that provide a variety of dinner choices. We felt fine there without masks; which we saw nearly no one wearing.
The state parks require a sticker to enter, and they need to be purchased online beforehand, as the entrances are not being staffed. We have one, but to be honest, it doesn’t appear that it is being enforced. Also, Dells of the Wisconsin River natural area is closed for the season. Nearby Devil’s Lake is open though; good hiking there. If Wollersheim Winery is open, it is a fun side trip. Our first timeshare unit was at Tamarack, and we enjoyed staying there.