There isn't a Hare isle on Horse Isle 2, only Horse Isle 1, where you get to it from Earton dock.
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There is a bear on Crater Mountain Isle that will get you to hidden for 10,000 dollars(:
You grab the veuns fly trap on Swampy isle. It the first one close to the dock. It will take you to Gas isle.
About halfway between the dock and the eastern end of the isle, by the northern beach
Go to Dumbell Isle boat dock and talk to the guy inside. He will ask you if you want to go.
From either Hotton or Hoof Isle docks