re: 3 weeks in the USA.

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I would not mind seeing the JFK stuff in Dallas and eating Texan food but I heard negative things about Dallas for a tourist.

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Dealey Plaza, where JFK was shot, is an interesting place. They have a museum on the 6th floor of the former Texas School Book Depository with a lot of information and artifacts and the window where Oswald was perched in enclosed in glass.

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I would like to go to one or two of the national parks but without a car they seem awkward to get to which is why I was thinking of doing a tour to the Grand Canyon from Vegas.

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When I went to the Grand Canyon I rented a car in Vegas and drove there. Stopped at Hoover Dam along the way. I don't really care for organized tours in general but you can definitely find one to the GC from Vegas if that's what you want to do.

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Would Dallas be the choice for Texas then?

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IMO, yes. But plenty of people would probably say Houston or San Antonio.

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I have never even thought of Denver. How do the Rocky Mountains compare in Denver to Canada because I might be going to Canada in 2019.

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IMO, the Canadian Rockies are way more scenic than the Colorado Rockies.

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Is the Grand Canyon still worth doing for a day trip from Vegas? It would be a long day but it goes to the South Rim which is the best bit. Only $89 for a round trip.

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The Grand Canyon is arguably the USA's most famous natural landmark. If you're going to spend three weeks in the USA I think it's worth a day to see at least some part of it.

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I’d skip Colorado and hit up Jackson Hole/Tetons/YellowStone.

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I would too if it's practical for the OP and he wants to devote the time and money to getting there.