X Country October 2012

[QTPYE]

Hi, I am organising a road trip from Los Angeles to Orlando in October next year. We will be hirering a car (one way drop off) from LA to FL for 30 days. Travelling with me will be my husband, my son, his wife and my 2 grandchildren, aged 1 and 4.
What I wish to know at this stage of planning is if the distance and where we want to stop off is doable in the time frame we have. My son and his wife request that we spend 4 days in LA at the begining of the trip, so this has to be factored into the time frame. Also is the distance between each leg a comfortable days driving while allowing some sight seeing and stops for small children to break the boredom of the driving?

1. Los Ageles to San Diego
2. San Diego to Las Vegas
3. Las Vegas to Flagstaff
4. Flagstaff to Phoenix
5. Phoenix to Tombstone
6. Tombstone to Las Cruces
7. Las Cruces to Roswell
8. Roswell to Dallas
9. Dallas to Huston (via San Antonio)
10. Huston to New Orleans
11. New Orleans to Tallahasse
12. Tallahasse to Daytona Beach
13. Daytona Beach to Miami
14. Miami to Key West
15. Key West to Naples
16. Naples to Tampa
17. Tampa to Orlando

I would appreciate any advice re these choices of routes and time as well as what would be worth seeing along these routes.