With just 5 days I would suggest just do Bangkok and perhaps day trip to ayuthaya or kanchanaburi would be worth traveling. For just two days to Phuket IMHO is worth the airfares and time traveling to and from the airport and to the hotel in Phuket which is most of then 45 mins away.
There are so much to see and do in Bangkok that will keep your stay very busy and interesting.
Just my thought :)
Sorry too late for edit
My post was meant to say " with just two days is not worth the airfares and time traveling to and from "
Thanks for the info. I have not booked my tickets to Phuket. It's good to know.
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