Get Ricky then get the floodgate key. Drain the water and jump down the left cliff. Go down once, then go left, get in the middle of the cliff, and press Up. Do the same thing when you get to the next cliff. Follow the path and you will eventually find a portal. Jump off Ricky, enter in the portal, and go down to the beach. Dig to find the Star Ore, then go to shop. Trade the Star Ore for the Ribbon. Return to the beach then go down to find Rosa. Give her the ribbon and go on date with her. You can now go to the locked doors. Open them, go to the temple and open the door.