Bring swimwear if you expect to have fun here....
Luggage and bags: I would most certainly recommend a beach bag, a good, common-sense such where you can carry beach towels, sunblock, sunglasses, aloe vera--you get the idea.
Clothing/Shoes/Weather Gear: I for one would have to recommend plenty of swimwear if you expect to fully experience the waterpark scene in Wisconsin Dells as it ought to be....
Toiletries and Medical Supplies: Sunblock. A definite must. Especially when the sun is out. As well as aloe vera gel or after-sun lotion.
Photo Equipment: DEFINITELY bring your camera. The photo opportunities aren't exactly confined to the Dells Boat Tours; heck, there's plenty of interesting such to find, including downtown and the waterparks!
Camping/Beach/Outdoor Gear: Thongs would have to be the best footwear I can recommend. Aquasocks might not be a bad idea as well, especially with the wavepools and waterslides.
- Road Trip
- Family Travel
Clothing/Shoes/Weather Gear: I think most important thing - a swimming suite! As I am sure you would love to go to one of many water parks. And if you forgot it - it is not easy to buy one as they are expensive and nothing really to chose from...