If you are planning to have fun with your friends during this term break, Water Park is also another interesting choice. Last week, I went to Vana Nava Water Park, Hua Hin, and my friends got a very cheap voucher for 690 baht from Thailand Tourism Festival O_O. Moreover, there is also 20% discount from full price for students.
Our journey starting from Victory Monument, I suggest that you should depart before 8.00am. So we do not have to wait for playthings because there are not many people come by the time it opens. (Make sure that you take the right van to Pranburi because it will stop by the Water Park).