Florida to Washington state round trip

Good morning all,

I am travelling end of September from Central Florida to Washington and returning with my RV that I left in the Northwest. I am looking forward to the three-week trip. Nice to get out of the Florida heat and see more of the countryside. I will see what is out there and want to stop at nudist resorts on the way back. I will be going down I-5, then across on I-10. Any suggestions?