BFF & I will be driving with a 4yr old boy and a small dog from Vegas to Rhode Island starting this Thursday 4/30. They were on more of a deadline and did RI to NV in 4 days. Going home we will have more time 5 to 6 days maybe 7 so looking for areas that would be good for stopping along the way. Haven't decided if we will take the southern route traveling I40 thru AZ, NM. TX, OK, AR and TN. I81 once we get into Tennessee. or the northern route, thru UT, CO, NE, IO, IL, IN, OH & PA. We are move familiar with the east coast as we get closer to home. Would like to see some of the old RT 66 and anything else we shouldn't miss while out this way. Any suggestions? Thanks for the help.