Visit Yellowstone and Teton National Park
If you have never hiked in the Wind River Range, I highly recommend doing so. Please reach out for good hiking recommendations (all different skill levels).
My favorite "easy" hike is Sacred Rim. It's about 3.5 miles out and back, with a view that's worth it! This hike can be found on the app AllTrails. (pictured above)
Many lakes and rivers around the Pinedale area are great for fishing. You can even plan a guided fishing trip.
There is a wealth of public access in the area, and information available through the Wyoming Fish and Game website.
Rent a boat from Lakeside Lodge and boat on Fremont Lake.
Visit the Mountain Man Museum.