Make sure you already have the rental car. They book out early.
Others have mentioned Uber. Haven’t done it but could see how it would be convenient sometimes.
Traffic is what it is. Right before and after airshow time it’s busy. As you approach the weekend it goes up. But your real problem is trying to drive and look up all the time.
It’s a small town that handles an onslaught of people fairly well. Certain roads off of the highway are made one-way during super busy times. The vast majority of the middle of the week it’s a no brainer and easy. You’ll spend more time hiking from parking than driving.
Commercial, Green Bay is closest but lots of people bite the bullet and do a longish drive up from Chicago. Tons more flight options and rental cars available.
Never done the drive up from Chicago but from the Madison area north, it’s a nice drive. Good roads and no stress.
Make sure to watch here for some night activities and stick around after an airshow some night. The “city” on the airport doesn’t really shut down ever or follow the airshow schedule which is one of the neatest things about it all.
You’re going to have a blast. Lots of walking. Good shoes. Sunscreen. Hat. Bug spray.
The airport is a couple miles long and most folks will find they’ve hiked the length a few times throughout a week. You don’t always mean to, you just start looking at things and realize you’re a couple miles from your next place to be.
I don’t even know if I can walk it myself now but long timers taught me to get a light folding chair that slings or backpacks well. Walk a while, find a spot near a flight line, stare at airplanes for a while from your chair, pick up and continue.
My first year I just spent an entire week walking and looking at things. Well that was also the year we had to drive back and forth to Green Bay and also to points south multiple times. The drive was never bad. It just took away time I could have been gawking at airplanes.