>>1450910Pinnacles at least has an interesting kind of beauty to it. Gateway Arch NP is just a bunch of grass and some buildings surrounded by a river and... St. Louis.
If I had to pick a park to upgrade, I'd probably turn part of the Eagle Cap wilderness in northeastern Oregon into an NP. That would include some of the Wallowa Mountains and some rivers/canyons/valleys. It's kind of surprising it never became one.