The campus is beautiful, although the NW weather can turn the grassy ground to mush. Virtually the entire campus is foot-trafficked, with no vehicles save emergency and maintenance allowed on narrow campus roads. There are a lot of bikes and foot traffic.
The college curriculum is challenging. It is a particularly science-heavy school, so the depth and challenge of the studies definitely necessitates study time. Class sizes range from auditoriums of hundreds of students in bacc-core classes, to around 20 in upper-division classes.
The town of Corvallis is very student friendly. Bus fare is free for students, and most venues are w/in walking distance of campus. Shops, restaurants, and bars are all close to the college, so a car is not NECESSARILY required. But it is extremely helpful to have, as most housing is difficult to find w/in a reasonable distance. Convenient, affordable housing is probably the most difficult aspect of the Oregon State experience.