Any tips on how much you think this would cost a group of 6 (adults and kids). We will rent a minivan and bring camping gear. Also, we will plan only from San Diego to Vegas to the Grand Canyon. We do plan to spend two weeks visiting relatives in Boston area but we won't be able to stay with them. Besides that it will be unplanned, what would you do or see? And how can we fit us all in the van with all our gear?!
Thanks in advance!