We visit the Henry Vilas Zoo each time we are in the state of Wisconsin. We love the small size and that it is free! Last time we visited it was December and 2 degrees and we may have had the park to ourselves, wonderful! We checked out the monkey house, polar bears and the seals. We weren't sure what else was open in the winter...would have been nice to have a handout on that seasonal information. Please leave a donation! Keep it free!