We're trying to compile it all so I'll update this post as you add information. We are creating a monster page and eventually maps for the island. Most of my alts are level 4 so I can't get information for the other levels.
http://www.nexusatlas.com/monsters/gogoonisland.phpIsland:
Takrai
Ginger Root - Gingerroot, 80k exp
Iomys - 800 exp
Iomy frontMini Turtle - 440k exp
Baby Turtle - 231k exp
Tiny Turtle - 167k exp
Pocket Turtle - 240k exp
Drift Sprite - 100 exp
Bee Cave:
Stinger Bee - Raw honey - ?? Exp
Killer Bee - Raw honey - ?? Exp
Sweet Bee - Raw honey - ?? Exp
Sweet Bee frontCrab Cave (no levels):
Decorator Crab Crunchy bug, Decorator crab shell - 800k exp
Scavenger Crab Crab meat, Scavenger crab shell - 180k exp
Eelgrass plantSalt water seaweed Soft Mud Crab Mud crab shell - 480k exp
Seaweed plant Salt water seaweed
Bird Cave:
Chae Sae - Black feather, fowl meat - Level 1: - Level 2: - Level 3: - Level 4: ? exp
Hanul Sae - Light Blue feather, fowl meat - Level 1: - Level 2: - Level 3: - Level 4: 10m exp
Mul Sae - Blue feather, fowl meat - Level 1: - Level 2: - Level 3: - Level 4: ? exp
Namu Sae - Dark green feather, fowl meat - Level 1: - Level 2: - Level 3: - Level 4: ? exp
Pul Sae - Orange feather, fowl meat - Level 1: - Level 2: - Level 3: - Level 4: ? exp
Sang Sae - Purple feather, fowl meat - Level 1: - Level 2: - Level 3: - Level 4: ? exp
Shim Jang Sae - Red feather, fowl meat - Level 1: - Level 2: - Level 3: - Level 4: ? exp
T'aeyang Sae - Yellow feather, fowl meat - Level 1: - Level 2: - Level 3: - Level 4: ? exp
Imp Cave (no levels):
Fire ImpWood ImpMetal ImpEarth ImpWater ImpFire DaemonWood DaemonMetal DaemonEarth DaemonWater DaemonFire AituWood AituMetal AituEarth AituWater AituGargoyle Cave:
Duzemb Spirit items ? - Level 1: - Level 2: - Level 3: - Level 4: ? exp
Rhino Cave:
Dull RhinoMinor RhinoInsignificant RhinoCommon RhinoInferior RhinoTolerable RhinoBulky RhinoBurly RhinoJumbo RhinoLarge RhinoOversized RhinoThundering RhinoImmense RhinoGigantic RhinoColossal RhinoTurtle Cave:
Pond Slider items ? - Level 1: - Level 2: - Level 3: - Level 4: ? exp
Mud Slider items ? - Level 1: - Level 2: - Level 3: - Level 4: ? exp
Leaf Slider items ? - Level 1: - Level 2: - Level 3: - Level 4: ? exp
Giant Mud Turtle items ? - Level 1: - Level 2: - Level 3: - Level 4: ? exp
Giant Black Turtle items ? - Level 1: - Level 2: - Level 3: - Level 4: ? exp
Giant Perse Turtle items ? - Level 1: - Level 2: - Level 3: 63m Level 4: ? exp
Yurtle Writhe skullcap, Entwined skullcap - Level 1: - Level 2: - Level 3: - Level 4: ? exp
Edit from LeA: Added a side view of yurtle, added a couple items from Crab Cave, and a couple exps from monsters.