There are a multitude of activities here that are sure to keep your kids interested. Arbor day is a "Wisconsin School Observance Day", observed on April 30, 2021. The Arbor Day movement began in the 1800s to promote conservation and beautification of the environment and has been celebrated in Wisconsin since 1883. This year, 2020 is also the 50th Anniversary of Earth Day. There are many resources online that provide learning activities pertaining to the environment: planting trees, identifying plants and trees, looking for wildlife signs, learning about aquaculture and more. Here are links to help you keep your students, a.k.a. children and young adults, busy while having fun outdoors. And, there are games too!
Learner Resources to Connect, Explore, & Engage (Google Doc) - This extensive list of resources, arranged by grade levels, was compiled by Victoria Rydberg, Wisconsin Department of Public Instruction Environmental Education Consultant. She did a great job with providing options. You should be able to find something that interests each of your child's individual personalities.
The Wisconsin K-12 Energy Education Program (KEEP) was created to promote energy education in Wisconsin schools.