In the large tower you can see from afar in the town to get to it you have to go to the beach area in the bammboo maze abit tricky to get to be warned the enemies in there can be hard and I don't think there's any save points aside from when you reach a new floor and if they defeat you you are forced to the main menu. Also could you try to tell me where the castle/ruins dungeon is so I can get all the nails for the plant quest the batonist lady gives