My boyfriend and I are planning a 15 day trip in mid October. We are looking at flying in to Denver. We are thinking roughly of Denver tyo Santa Fe, Grand Canyon, Vegas, and then back via Utah or Salt Lake Cirty. Is this too ambitious in 15 days? We did a 10 day 2,500 mile trip in California so driving long distances is not a worry. Any suggestions, possible problems or must see locations would be appreciated.