I've just returned from a gap year that included Asia and i will definitely be going back! Bangkok is fantastic and the islands (Koh Tao and Koh Phangan specifically) were fantastic!
A few tips for you all though:
- have good travel insurance if you plan to hire a bike (check what cc of bike it will cover & hire accordingly)
- book trains well in advance, especially if heading North overnight
- take PLENTY of insect repellent
Before I left I looked for ages to find a decent journal to write about my travel and my mum managed to find me one from http://www.ktwoproducts.com/products/31_travel_journal! I'm loving looking back at all of my memories!! I bought one for my friend and even got a 20% discount after 'liking' them on Facebook!! It sounds like I'm selling, but really I'm just recommending. I wish I could go away and fill it up again!!