Not worth the money
Some very good rides, but way oversold and overpriced. Expensive to get in. There's no hope you will get on all rides without the fast pass. Food is actually reasonably priced (so don't get the VIP). Best to get there early and stay late to her some shorter lines.
Siam Park
We’re pleased you found plenty of excitement in the attractions, though we’re sorry the overall experience did not feel like good value. On busy days, demand can be especially high—much like at the world’s most popular theme and water parks—and this can affect waiting times despite careful capacity management. Arriving at opening and making the most of the final hours is indeed a great way to enjoy a more relaxed day. We also continue reviewing operations, guest flow and admission options to help every visit feel worthwhile, whether guests choose a standard ticket or an enhanced experience.