I love that your grandson is so intent on seeing the University of Oregon! It’s a gorgeous campus so please be sure to take the whole tour! As far as baseball games go, check out the University of Oregon’s baseball website. Also, please see my friends at the Eugene, Cascades and Coast Adventure Center in Springfield when you come to town. There you will find tons of info on so many very cool things to do. From Portland to Eugene, please take the slow road, highway 99 and enjoy our scenery, hiking trails and perhaps a stop at our beautiful Silver Creek Falls. You will be amazed to find such a place right here in Oregon.
Eugene is surely the place for fun and lots of outdoor activity to keep a 14 year old very busy. Perhaps renting bikes at Paul’s Bicycle Way of Life and riding along the Willamette River would be fun. Taking a picnic lunch and exploring by bike is one of the best ways to experience the city.
Also, if you need someplace for lunch or a dinner, check out of the McMenamin’s in Eugene as well. Delicious local food and something on the menu to please every age.