We bought a Sentosa Fun Pass 55 Token & able to use it to enter Trick Eye & Water Park. We topped up the tokens at the counter, it is cheaper & easier. There was a tiny problem tough, we had paid Fun Pass but we've waited more than 45 minutes for the voucher to be issued while we have arrived at Sentosa. I contacted CS, they're very helpful, voucher was released 10-15 minutes afterwards. Overall, we had a great time at Sentosa & will comeback with 80 tokens instead!