http://www.nexusatlas.com/60atlas/southernkoguryo.phpSouth of the cemetary, check the map. The entrance to the northwest goes to the courtyard. If you are higher levels you can go to the clan houses which are truly deadly. The courtyard is very decent experience. Rogues can solo there if they are careful.
The Flower cave is on Gogoon Island. You can sail there from Dae Shore. Go to the extreme North east to catch the boat. The Flower cave is at 98/116. You stand a decent chance of getting shipwrecked and make have to cut some stupid wood to build a ship to get to Gogoon Island. Go to the shack in the middle of the island to talk to the NPC. Once you get a load of wood you can continue. Lame quest. Cut enough, bank it and the next time you get shipwrecked you can get it out of the bank and not have to spend time doing that again.