One time trip CO to GA- suggestions?

Hello helpful RVers.

We are a family of 4 moving from Denver Colorado to Atlanta Georgia this June. Since we have 3 dogs and 2 birds, our plan is to rent an RV thru Cruise America. We've done this once before, when we first moved out here. Then, we played it safe and took I-70 most of the way. This time we'd like to be more adventurous and take a more southerly route...say I 25 to Santa Fe followed by I-40 and down to I-20.

In beginning the research for the trip I find myself overwhelmed. Where to begin? Can anyone help? Where do I find information? Any must sees or must dos? Any killer camping spots with lakes, trees, swimming, etc.? We hope to take 5-7 days to get there.

Many, many thanks for your help!