One of the best restaurants is Cabbages and Condoms all the profits go to their Aids awareness Charity and you get a free condom and the end of your meal. They also have a store which you can buy ornaments made out of condoms (don't worry they are not in obscene shapes flowers and stuff)
For around £35 a night quite a lot in Thailand you can stay in the Hilton, I stayed there it's a little out of the way but worth it as your treated like royalty. You can hop on their boat to cross the river where you can get the sky train which costs as little as £1.50 for a day ticket and takes you round the main parts of the city.
What i can't stress enough is the brilliant Groovy Map which you can buy on line. it is one of the best guides i have had much easier to read and understand than the AA or Lonely Planet guide.
But for a guide for the rest of Thailand South East Asia on a shoestring is good, but if it is your first time you can easily find a travel agent on every corner or street in the popular areas which will have hundreds of trips to go on and try. If you like home comforts (Starbucks, McD's, Baskin and Robins, Bowling alleys Bungee jumps) Phuket and Koh Sumi are your place to be but if you want sandy beaches and quite you should try Koh Tao or Koh Phang Nang. All the major resorts have recovered since the Tsunami, so you wont have trouble finding anywhere to stay on the islands.
I know it is exspensive £120.00 round trip from Bangkok to Phuket to Koh Sumi but flying is best way to travel you get there is less than a hiur to each destination, whereas boat or bus can take over a day, and waste precious holiday enjoyment time.
Thailand is basically the Costa del Sol of Eastern Asia, there is everything and anything for all ages, just try whats out there most likely you will enjoy it.
But the best thing to remember is that as soon as you get out of Bangkok airport ignore everyone and head for the green/yellow pink and blue taxis these are metered and state you want the meter on as they will charge you 600 baht for a trip metered will cost 300 baht
Common Sense is the key don't get in a taxi that looks doggey as the hotel how much a taxi or tuk tuk (which are fun) should cost and walk away if they want to charge you too much.
If you want to see the red light district you don't have to go into the closed door bars they will often charge you to leave and will be full of dirty old men (well you probably already guesed that).
You can view it if you want of course, from a open air street bar.
If you like the club scence one of the most popular Farang (Thai for travelers quite offensive word actually) the Green Mango is quite good not so much a dance bar just a good place to partyyyyyy.!!!!!