On the roof of the Mall Bangkae, Fantasia Lagoon is a large water park that is relatively unknown to tourists but popular with local Thai families. With a choice of big pools and slides, Fantasia Lagoon is a great place for kids of all ages to visit, especially as it has recently been refurbished and costs only 100 Baht (approx £2). More than just a waterpark, there is also a large mall with shopping and games and entertainment zone located just below the park. Another option on the eastern outskirts of Bangkok is Leoland Water Park, another huge rooftop park set atop Central City Bangna shopping mall. This park features waterslides, tube rides and sunbeds and is worth a day trip, especially if combined with shopping. Check out Dream World and Siam Park too, for even more family fun.