The Milwaukee county zoo is definitely worth the price. My 4-year-old loved viewing the different animals and exhibits, especially the reptile one! The variety of animals and environments give you a lot to look at. The different sections are very informative and educational. The zoo is very clean and beautiful.
There is also lots to do! The rides are fantastic. We loved the train ride the most. There's also face painting and a petting zoo where the children can feed the mini goats. So adorable and a great hands-on experience for the kids.
Definitely plan on going back.