Ragnarok: Turtle Dungeon Quest

Go to Alberta. Walk straight up to the building with a warp.



Turn right.



Speak to Grandpa Turtle. Select -Tell me about Turtle Island-.




Select -Eyes Twinkle-.




Go to the docks on the right side of the map.
On the left or Jornadan, there's A Voyage Log. Read it.




Speak to Gotanblue to sail to Turtle Island. It'll cost you 10,000 zeny.