Absolutely wonderful. Love to go on walks here with my wife. Scenic, calm and filled with beautiful trees and plants.
Can get rather crowded on a nice day. If you're a biker, it's a bit of a hassle sometimes. If you're a walker/runner, it can get a little congested with bikers. Quite the double-edged sword.
Best to start from Johnston rd if you're not a local. More parking and bathrooms/water. Best since its in the middle of the greenway. Also, parking on 51/Johnston is relatively good as well. Enjoy!