I am in Fuerteventura right now and was just checking on my emails, and saw that you are going to Bangkok for the first time and Koh Samui, as well as Phuket. - At least I have been to these three places, a couple of times.
Well, my favourite is Koh Samui. You don't want to spend much as you say, but have in mind that life is cheap there. I have forgot the name of the resort we stayed at the first week while we were there, but you can find everything including photos in my second blog if you check. It was a PARADISE. It is worth even if you spend one day there before doing anything else! Check that out pls. It was 3 min by taxi from the airport. And you can take a mini tuk tuk to carry you there for nothing believe me.
When we left this hotel, we wanted to go more centrally I booked another hotel for another week. The beach is much better centrally, but the spot I am telling you was a paradise. We got a taxi to take us there, but asked the taxi driver if he could take us around the island the next day and the cost, and believe me what he asked was not more than 3 euros then. Now it should have been something like 8 I am sure.
(I was in London some days ago, and we had to pay SO MUCH for buses and the tube)!!
Anyway, I had found every detail on the net, and knew exactly what was going on.
Study the map well and read about what every village offers. YOU WILL LOVE Koh Samui!
See pictures in my blog, and make comments or ask anything you wish to know.
Now about Bangkok, be sure to have some massage there. As Louise said it is very cheap and you will remember it forever! We have been down there 3 or 4 times!
Be sure to go to the float market and visit James Bond Island.
I did not visit Krambi so I can't help, but I plan a visit there probably next year as I have missed Asia and the smile of these beautiful people out there.
Do some search on the internet and enjoy every moment of this trip. It is worth it.http://www.travelpod.com/members/greekcypriot
(New entry of Meteora and London sightseeing today)
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The World is a book, and those who do not travel read only a page. ~St. Augustine