Siam Amazing Park

Siam Amazing Park in Khan Na Yao is Bangkok’s original theme park — it opened in 1980 as Suan Siam, Thailand’s first water park, and rebranded to its current name as the founding family handed the business to its second generation. The site combines a 100-acre water park and land-based amusement park, and its wave pool holds a genuine Guinness World Record: certified in 2009 as the largest artificial wave pool on the planet, at roughly 13,600 square metres.

Water World covers slides, a lazy river, and the record-setting wave pool, closing an hour before the rest of the park at 17:00. The land side, Xtreme World and Adventure World, runs coasters and thrill rides alongside a dinosaur-themed garden and a smaller Family World section for younger children. Ticketing is height-based rather than strictly age-based — riders under about 100 cm generally enter free, with a child rate for those between 101-130 cm and an adult ticket above that.

Watch out: “Southeast Asia’s largest water park” gets repeated on booking sites, but the only independently verified superlative here is the Guinness-certified wave pool record — treat broader size claims about the whole park as marketing rather than a checked fact.

Pricing differs sharply by nationality and by where you buy. Thai residents pay a printed gate rate around 500 THB for adults, 150 THB for children. Foreign visitors are charged a higher combo rate — online platforms typically list it at 850-1,000 THB for the full water-and-land ticket, with walk-in gate prices running higher again. Booking online in advance is worth doing regardless of nationality; it’s consistently cheaper than paying at the entrance.

The park sits well outside central Bangkok in Khan Na Yao, so factor in traffic time; there’s no BTS or MRT station within walking distance. For a lower-key family alternative closer to a metro line, Safari World and the Bangkok Butterfly Garden and Insectarium cover similar family-day territory elsewhere in the city.