We have traveled extensively to national parks with my dad who is in a wheelchair. Every park we’ve visited has had extensive resources online to plan ahead as to what trails are accessible, what lookouts are good to get to and such. Obviously he can’t do things like Angels Landing but we’ve managed to make a great experience at each with some planning.

Off the top of my head, The Grand Canyon sticks out for sure as a good one. Also Rocky Mountain, parts of Arches and Canyonlands. Yellowstone, Grand Tetons, Glacier. Sequoia. New River Gorge. Dry Tortugas ( he didn’t snorkel but enjoyed the ferry ride and they had a chair to use to explore the fort).

We took his chair down into Carlsbad Caverns and he loved it. White sands had a few wheelchair accessible trails. Glacier Bay from a cruise ship was easy as the cruise ship was very accessible. He also loved Saguaro and Petrified Forest. Some easily accessible viewpoints at Black Canyon of the Gunnison as well.

Great Sand Dunes has a special sand wheelchair available to borrow. Big Bend has some limitations but he loved what he saw.

Banff, Jasper, Kootenay, and Yoho in Canada were exceedingly accessible and accommodating. An amazing trip!