haagen_dazs said:
try not to bring too many expensive stuff
thailand (depending on where you go) may not be all that safe
do take care!
try to stay more with wide angle lenses as oppose to mid teles (unless you really want to get that kind of close up shots)
there are alot of architecture and scenery shots to photography
haha, Thailand is much safer than any US metro area. The worst thing that will happen is that someone tries to tell you about their cousin's guesthouse, or wants to practice English with you. It's a very low-pressure friendly place, have no fear for your or your camera's safety.
There is civil unrest in the very remote south, near the border with Malaysia. not a particularly scenic area anyway, but something to be aware of. police and municipal government, not tourists, are the usual targets.
10 days isn't that long, I wouldn't suggest trying to see the whole country. Personally I would head to the islands in the Gulf of Thailand. My favorite was Ko Tao but there are hundreds to choose from. Pick the balance between cheap/unspoiled/remote vs urban/touristy/high class services that you prefer. Good time to get a dive certification, high quality but extremely cheap. The weather in the islands this time of year will be very pleasant, water will be skin diving with no wetsuit needed.
In Bangkok and in the north it will be quite hot and muggy - I often shot before dawn until noon, took a cold shower to cool off, napped under a fan, and went out again for the late afternoon and dusk. For a 10 day pleasure trip I might skip it, I was there for 3 months and wanted to see everything.
If you're shopping for guidebooks, I much prefer Rough Guide to Lonely Planet. Better suited for photographers - more info about notable architecture, customs, art etc.