1st Visit to Spokane

We have family that moved up to Spokane a few years ago and this will be the first time we’ve gotten a chance to fly up there and visit them. Our visit will be in late September and we will be there for 5 days. We are mainly going there to see family but we would like to see some sites while we are there, however, we don’t really know much about the city. Our family consists of me, my husband and our two kids who are 11 and 13. What are some places you feel are a “must see” while we are there? Also, what are some good places to eat and get a coffee? TIA