This may sound strange, but the best trip of my life that me and the wife had was the move from the east coast to the west.
We were on no timeframe, no budget, stopped whenever you felt like it, or if there was something you wanted to stop for, stop and take your time.
Just jump in the car/truck and drive. Stop when you feel like stopping, see whatever is along the route. Have a destination, but not a real ETA.
This is a huge country, and very different in very different regions.
There was nothing better than being with my wife, and just doing whatever, whenever we wanted, and not worried about appointments, reservations, or schedules.
I've had too many vacations that also turned into a chore because you had a checklist of everything you needed to see or do while you were there.
Having NO schedule, and maybe an ultimate destination with no particular reason... I'd love to do it again.