I've only been to Coronado Heights one with Samuel and his mom Julie. We walked around, captured a few pictures, and took in the view. It was an amazing experience.
You drive though the refuge and watch the buffalo. I've been before and it was an enjoyable experience for someone who had never seen a buffalo up close before.
Lindsborg is well known for their Herd of Dala Horses around town. If it's not to hot, taking a walk around the town, looking at the horses and reading the plaques may be a fun activity.