There are other immunisations you could consider, but most people seem to do fine without them. They include:
You should discuss whether you need these or not with your GP or practice nurse, but the vast majority of people don't. If you are to volunteer with animals though, for example, you may want to get the rabies jab (even though it's prohibitively expensive!).
The majority of Thaland is malaria-free, so unless you are visiting neigbouring countries such as Laos or Cambodia, you generally don't have to worry about malaria prevention. Again though you can discuss this at your GP surgery, as you may be visiting a specific border area that happens to have malaria.
Also be aware there are other mosquito-borne diseases around Thailand such as dengue fever and chikungunya, so just generally try to avoid being bitten by mozzies. Try as much as possible to wear longer sleeves and trousers (though this can be difficult in the heat), and also get yourself an effective insect repellent with a high DEET content.
You may also want to carry a mosquito net with you for extra protection.