stormgirl said:
I am meeting my brother in Thailand next April, he hasn't really travelled before, so hoping to make this a great experience for him. We only have 2 weeks, hoping to spend only a day in Bangkok, then head to an island, where he can go diving, and I can either snorkel or just hang about.
Any suggestions, must sees, avoid at all costs or advice appreciated

If it's his first time really travellling, and you have 2 weeks, here's my advise
Stay a night in Bangkok onn Koh San Road. It's backpacker central, but is worth checking out for a night. Best place to stay (I think) is not on Koh San Road itself (as the bars are noisey until 3am and you can't sleep at all) ... go to the NON BK end of Koh San Road, ansd walk diagonaly accross road, and walk down the street which is diagnolly opposite Koh San Road. After the first hard left turn there are some cheapish and nicer guesthouses down the side roads.
Go to Ayutaya (the old capital) for a night. It's only 90 minutes from Bangkok, and is worth checking out for teh old temples and laid back vibe.
Back to Bangkok and catch a night train or night bus South. The train is easier to sleep on, but teh bus takes you direct to Surrat Tani (where you catch the boats to teh islands). Because rthis is the first time for your bro in Thailand, mayube stay on Koh Samui. Itä's more commmercial and touristy, but that will probably be good for him.
Try catch the full moon party on Koh Phangang if it's on. Catch a boat to Koh Tao one day and go snorekking. Best in Thailand.
Finally, book a flight and fly back to Bangkok from Koh Samui.