I think the only shortage is the time limitation of staying in certain places of interest in Columbia River Gorge.
Beautiful. Very knowledgable guide. Not enough time in each location, though.
The Columbia River Gorge part was nice. Enjoyed the scenery on a comfy bus with a great tour guide and cool travelling companions. The hop on hop off part was helpful to get around but the bus drivers had questionable driving judgement (almost a couple of collisions) and almost half of the tour was unavailable on Sunday because of the marathon. Since we didn't have much time on Saturday after the Gorge part, I feel like we missed out.