This. Fun, cheesy, and gigantic. Worth visiting, but figure on spending a whole afternoon there. To get there, stick to curvy county roads (anything named with a letter) and enjoy a nice scenic drive in the Driftless Area.
Not too big a detour from there: Cave Of The Mounds.
Stop in Mount Horeb and go troll-spotting.
Madison? Fantastic. Park at the bottom of State Street (Lake Street parking ramp), walk (up State Street) to the Capitol and back, sampling shops and restaurants along the way. Traffic is limited to buses, taxis and official vehicles, so criss-crossing on a whim is easy; just watch for folks zooming by on bicycles or skateboards.
Walk up Bascom Hill.
Check out the University Book Store (on Library Mall) for more Badger-related crap than you can shake a badger-killing stick at.
If you time it right, the farmer’s market on Capitol Square is humungous and amazing.
Also depending on timing, you might be interested in a Concert On The Square. The Wisconsin Chamber Orchestra plays live classical music on the Capitol lawn, and listeners (the ones who plan ahead, at least) spread a blanket out and have a picnic.
Speaking of the Capitol, check it out: it’s modeled after the US Capitol building in DC.
Also also dependent on timing: Maxwell Street Days, when State Street shop owners shuffle their goods outdoors for sidewalk sales.
Have a beer and a brat (or a couple of each) on the Memorial Union Terrace, a lakeshore beer garden operated by the university. Live music many nights during the warm months. If you’re not an alumnus there’ll be a $5 fee to get your evening there started, but if you’re gonna hang out for a while, it’s worth it. The summer is a great time to be there because the undergrad students are all gone, making it much less crowded; you’ll just be sharing the space with grad students and local residents.
Park near Picnic Point, and hike out to the tip of the narrow peninsula.
Looking for a longer walk? Start your hike at the Terrace (there’s a parking ramp there), and follow the path around the lakeshore to Picnic Point.
Looking for a better view of the lake? Check out Observatory Hill (Take Observatory Drive west from the Union; you’ll know the view when you see it).
Visit the headquarters of The Onion and pick up a souvenir mug.
Consider a food tour. Whether you do a tour or not, Madison has a ridiculous diversity of restaurants to choose from whenever you get hungry: Himalayan, Japanese, Greek, German, Jamaican, Afghan, and tons of others. OK, maybe not the Jamaican anymore: I just found out that Jolly Bob’s Jerk Joint closed a couple of years ago.
If you want historic greasy-spoon fare, try Mickie’s Dairy Bar.
Visit the Henry Vilas Zoo; admission is absolutely free.