Places to see?

Hi r/Tucson! I am coming to Tucson next spring for a swimming competition. My team and I have planned to go sight seeing, but we would like to know what there is to see. None of us have been there before, we are from Canada. Also we are underage so no bars etc. Could you please help us out?

Edit: thanks very much! All of you! I will definitely google these places and talk with my team about what we want to see. Apparently we have to go to the desert museum, because everyone here suggested it!