Had a great day at the Lost Paradise water park. Whilst its 13 dinar to get in which is a bit pricey it is a good day out for all the family.
You get a wristband which can be charged with money for food and drink and all the rides were great. The whole pack was very modern and clean with large changing rooms and both lockers and towels available for hire.
It is very easy to find when driving from Manama, just follow the signs to the international circuit and is about a 20 minute drive.
Highly recommended.