Then you circle all your way over the map clockwise, to Dragon Roost Island, over Forest Haven and so on. Your goal is in the center with the Tower of the Gods and you start right at the north of it on Windfall Island. There's also a very clear path through the whole thing. It's also not as big as the normal Adventure Map - the Great Sea Map has 7 rows and 14 columns, which makes 98 battles altogether. It went very smoothly and I suppose that this is the easiest map of the game. You get all Level 2 weapons here and one costume for every single character in the game, which is nice.
100% - all A Ranks, all weapons, costumes, Heart Containers, Heart Pieces, Gold Skulltulas and Fairy Clothing. After conquering the Adventure Map, I went on to the Great Sea Map and actually just now completed the whole thing.