We're thinking of travelling from Calgary to Vegas (plane) and hiring car to do Bryce/Zion/Grand Canyon. Just wondered whether we should be considering Yellowstone instead. Excuse my ignorance (I'm from DownUnder so this is not my homeland) but what would be the best place to fly in to if we did Yellowstone or could we drive. Which would be the best trip? It's unlikely that we'll do a holiday like this again in the US (as we'll be going home next year) so are the two areas similar & which would you suggest? We could have between 1 & 2 weeks for whole trip but don't want to spend most of it behind the wheel. I realise that this is a very broad and subjective question but would be interested in your thoughts.