If you use a tuk tuk negotiate the price first. Carry a Bus road map. I think the Thais are afraid of heights as not many seem to frequent the sky train. Its well marked and you make a change if going to Silom Rd from say Sukhumvit. On the plus side its faster than a cab or bus.
Thai food is delicious.
When you see a place full of Thais then give it a try as the food will be safe. Carry money as you need it. If out late at night try not to wear too much gold especially travelling outside Bangkok. Caused by pills being dropped into your drink. Even a full bottle of water can contain drugs.