Vegas

Antelope Canyon (upper or lower) and Horseshoe Bend in Page are worth visiting. Glen Canyon Dam is another spot nearby you could stop at.

Absolutely yes

Antelope canyon is impressive but it's a crowded multi tour group situation. There are other slot canyons in the immediate area that aren't quite as beautiful but also are more open to explore without the choreographed maneuvers of the guides who do an excellent job of getting cool pictures of everyone in the group in all the best angles and then shepherding everyone along to the next spot at antelope. If you ever have the opportunity to combine that area (horseshoe bend, lake, slot canyons) with the Grand canyon that is also an option.

If you’re going to be in Vegas, look up Valley of Fire! It’s a state park about an hour and a half drive outside of Vegas with incredible rock formations/hiking/petroglyphs! Definitely worth the drive and way closer