That is actually not true! You can NOT get to Rockhopper island by playing Hydro - Hopper! The answer is: When Rockhopper comes in summer, go onto his ship and stay there until he leaves, (I haven't done this before but i think this is true, and you have to stay on the computer) and then you will be there and you will get the stamp for doing it.
You can get to rockhopper island by getting to level 25 in hydro hopper.
Play hydro hopper up to level 25 then you will be there
the hydro hopper is on club penguin, at the dock
You can not sink the Hydro-Hopper boat
hopper hopper
Hydro Hopper is a game on Club Penguin at the Dock
bouys can be found when playing hydro hopper which is found at the dock Mnbvrulez
Rockhopper Island does not currently exist. Some people say that if you complete hydro hopper you will see it.
there is no map duuhhhhhhhhhhactually there is. if you get to level 25 on hydro hopper you unlock a map and it says go to rockhopper island. hope this helped :)
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If you mean in club penguin ice fishing has a shark in it and so does hydro hopper (although hydro hopper only has shark fins in it
on level 15 keep on pressing space on your key board and you get to rockhopper island on level 25 ta da!