where is the best place to enjoy water parks in summer days!

Splish , splash! As summer heats up, it's time to cool down and the best choice is water parks!
while where is the best place to enjoy water parks in summer days? I will give you some suggestion.
as we all know,Coastal areas, especially Mediterranean coast is the most welcomed place.
coastal areas in Portugal and Spain are welcomed by most people all over the world.
in addition, Australia,and New Zealand is also the best place to enjoy water parks in summer
days!
that's the place to have a travel in summer days.
 while there is another choice: bulid a indoor water parks!
here is a web maybe useful: www.chinawaterparks.com