When you go to a park with children you don't need a planned route to walk. Plan on exploring. Pick a habitat and let your curiosity lead you. Below are some ideas for different types of habitats.
Follow your curiosity and plan on getting a little bit dirty
Throw aside your fears and explore with them
Let the adventure create the lesson
A field is a great place to sit down and read a book, eat lunch or looks for insects.
A forest is a great place to stay cool in the summer while searching for insects under logs or animals high up in the trees.
A pond is a great place to look for birds and amphibians.
A stream is a cool place to get wet while searching for organisms above and under the water