Antelope Canyon

Yes, there are other cool things to see and do in the Page area besides Antelope Canyon. There's Glen Canyon Dam just outside of Page. There's the Horseshoe Bend view point southwest of Page. There's a variety of trails around Page. North of Glen Canyon Dam there's the Wahweap area with a marina and campground, where one can rent a houseboat (at least you could pre-pandeminc) or other boats. My step-daughters worked there at the marina one season cleaning houseboats and got to meet a few Hollywood types who came there to get away, so there's that too :C . Further out from Page there's the historic Navajo Bridge over the Colorado at Marble Canyon.

There's plenty of other things to do depending on how much time you want to spend there and how far out. Since you're relatively close, there's also the North Rim area of the canyon that's definitely worth it.