I have an extra 5 days in my trip and am looking for a beach destination to add to Koh Samui and Koh Tao. Is it sensible to go to Phuket for those 5 days in July given the risk of the weather? Or should I just stay on Koh Samui locale? I plan on scuba diving and snorkeling in Koh Tao so I don't need to do that in Phuket. I just want to lay on the beach and get some sun and take a day trip to Koh Phi Phi. Historically speaking, is the risk of poor weather be so high that I may end up stuck inside my hotel?