One of our FAVORITE activities is visiting our local zoo.
We currently live in Indianapolis, about 8 minutes from our zoo, and often will run over 2 or 3 times a week to hang out even for just an hour. (But even when we lived in South Bend, we visited the zoo often on a yearly membership)
The Indy Zoo yearly pass will set you back $136 per year, but if we annualize our visits, conservatively figuring we visit about once a week over the entire 52 weeks, it comes out to $2.62 per visit.
I love math that works out like that.
In the cooler months, we bundle up and rush from indoor exhibit to the next indoor exhibit
In the summer months, we pack swimsuits and finish our visit in the splash park.