Definitely, do it, take the kids its amazing
we bought our flights well in advance and got direct ones for £450 each. Once in Thailand it is so cheap,we were spending about £10 a day for 2 of us for lunch and dinner and a beer each by eating at local street stalls.
We even found a fabulous all you can eat, barbecue your own buffet for £2 a head by the river,and even had live entertainment too!
Taxis are typically £2 for a decent length journey,the river boats are a few pence and even seeing tigers and spending a day with elephants isnt expensive.
Overall we spent less than we do in Turkey even taking the flight costs into account.
Still love Turkey the most though!