Super informative tour for all ages, highly recommend. There is no cost but you can donate. They have a little green trolley and they take you past all the beautiful historic homes in Corvallis Oregon. It takes about an hour and only goes in the summer on Sat at 1pm. This year I am told the dates will be July 11th, 25th, August 8th, 15th, 22 and 29th. Reservations required call (541) 757-1544. Really worth the trip. The folks at the phone number can tell you more.
Keywords: Free, Less than 3 hours, In the city, Everyone, Summer (June - August), With public transportation