An amazing experience.
I've been there twice before, during very busy holidays. This time, I went on a weekday. It happened to be a school holiday because the teachers were having a meeting.
I bought tickets online via Traveloka the day before. The price was much cheaper than buying offline. Wahoo opens at 9:00 AM. We arrived at 9:30 AM and there were only 8 cars in the parking lot. It was quiet.
The entry process using the Traveloka barcode was very easy. Just walk in and deposit money for snacks later in the park. You get a rubber wristband for your food purchases, so you don't have to bring your wallet. You go straight to the locker area to store your bag. Oh, and there's a bag check beforehand. Then, you can go on the slides. Some open at 9:00 AM, while others only open at 10:00 AM and 11:00 AM. It's okay. Because it's not crowded, we can go on the slides repeatedly because there's no queue. If there is, it's only a short queue. Next, there's the wave pool at 12:00 PM and 3:00 PM. For the wave pool and river pool, you have to pay to rent a tire. The waves only last 15 minutes. The food there is delicious and quite affordable compared to water parks like Waterboom Bali, which have high prices. So we snacked and ate a heavy meal at the same time. At 4:00 PM, we finally showered and got ready to go home. The bathroom and changing room were spacious. The showers were powerful and had hot water. The changing rooms were also clean and quite spacious.