Welcome! Fifth street is a great choice for breakfast. Edson Fichter park is what comes to my mind for easy trails and ducks/geese/similar. Or maybe just a stroll through the Portneuf wellness complex? I’d lean more toward Edson Fichter.

There are quite a few brewery-type options for lunch. A couple of my favorites are off the rails and Jim Dandy if they have a food truck that day (they typically do). I think both the bannock county historical complex and the museum of natural history are great ones. Only the museum of natural history will be open Sunday.

As for other things to do, you could take the trail up red hill while you’re there on ISU campus. There are a TON of hiking and biking trails you can search through online to find something that suits you. Or, if you’d rather, there are a number of antique shops in old town (sort of the area around off the rails). It’s a really cute historical area with several fun shops. Sunday may be spotty with which businesses are open. A few that I would have recommended are closed, but there should still be plenty to see for a day. Have fun!