I don't think a week is enough time to hop around from resort to resort, you should just pick one and enjoy it. A week is not a particulatly long stay at a resort, after all.
I am in your age group and love Rayavadee, so I would just stay there for the entire week and do some speadboat and land excursions.
Or, do the same in Phuket at one of the resorts there like Amanpuri or Trisara. That would be a good option if you want to be able to explore differnt parts of Phuket by car.
You can do the same speadboat excursions from either Phuket or Krabi.