We booked this place because of the water slides we saw on photos but found on arriving it is a water park and kids leisure resort. Perfect for our 7 and 10 year olds. Apart from the water, the available activities fall into 2 kinds you pay extra for after your complimentary vouchers are used - motor sports (ATV, go karts etc) and cable cars up and down their hill. Enough for a couple of days. It's worth bearing in mind the resort is focused on the local market and the English isn't great and the safety standards concerning kids activities might be lower than you are used to, so you need to make some calls there. We didn't allow the kids to go motoring.
This place is near the beautiful national park, but due to a stuff up regarding a rental car we didn't have any transport and the resort doesn't arrange it given their kids activity focus. So unless you have your own wheels or arrange an external taxi/guide you won't get to see Khao Yai. Luckily we got a short tour from a worker after his shift, but it was a favour, not official.