How about this, a water park open at night during Fridays and Saturdays in summer? Pretty cool, huh?
At siam night their are hardly any queues, the park is lit up, rubber rings are illuminated and DJs bang out chilled tunes throughout the park.
It opens at 8 in the evening and closes at midnight, and don't worry about getting back to your hotel, Siam Park even provide a free bus to the resorts every half hour.
My Guide website?