Board Thread:Questions and Answers/@comment-31513931-20170313210218/@comment-26491320-20170313211136

Around the walls you can find a honey Gordo which gives you another slime key

You can then unlock

The ruins 2 Gordo's (both have keys)

The Indigo Quarry 3 Gordo's 1/3 have Slime keys and 1/3 has a teleporter to another island and 1/3 has a return pad to the ranch (needs The grotto unlocked)