If you end up with 2 weeks it might be worth considering either driving from New York to Vegas, or taking a road trip from Vegas to Vegas [a loop] and then flying to Hawaii and leave one for another time. You technically have time to do your "potential" list, but 2 weeks is the bare minimum I would even contemplate for this trip and with so much to see and do you might not have enough time to fully enjoy your interests.

From New York I personally would look at driving through St Louis [Gateway Arch etc] into Colorado and southern Utah and down through Arizona for some spectacular and diverse scenery with history, walks and National parks aplenty. With 2-3 weeks and Hawaii on my list, I would either do the 'Grand Loop' from Vegas to include Zion, Bryce canyon and the Grand canyon NP's with other attractions such as Lake Powell, Monument valley Sunset Crater, Hoover Dam and perhaps Red rock country around Sedona before flying from Vegas to the Islands.......or drive from Vegas to the coast and fly out to the Islands, possibly Death valley to Yosemite NP to San Francisco and explore the specatacular coast around Big Sur to LA for your flights.

That's just a brief look at A FEW of the possibilities out there and that is why it's important for you to do a little research [or better still a lot] and once you have the basics of your trip sorted we can help to 'Fine tune' and offer meaningful advice.