The little "bumps" in the map on the second screen are actually obstacles that you have to walk around, so just follow the map in the order the treasures are listed. Once you get T3, go all the way to the east, then take the stairs down to the bottom of the screen.
That's it! Now just go south to exit to the World Map. Your next destination is the Small Village, which is literally just a hop, skip and a jump away.