Never mind. I finally got past the hard part. anyway, I have a tip for earning rupees REALLY fast. (assuming you are using a flash cart with ar support or have an ar)
activate the AR code for moon jump, then go to the island in the middle of the 3 big rocks in the 3 quadrant of the sea. it is not on the map by default, but when you go it will show up.
there is a statue that lets you pay it 50 rupees to turn on a jet thing and go dig up 10 treasures. these are the different things I have found:
green rupee(1)
blue rupee(5)
red rupee(20)
big green rupee (100)
black rupee(-10)
big black rupee(-50)
treasure map(red x)
weird thing that asks you questions; choose top options and you get 100-200 rupees.
since you can get just black rupees if you're unlucky, I reccomend just moon jumping over the little statue so you can start digging. once you dig up 9 things, the little thingy tells you so, then you can dig up your 10th, then 1 more. but if you do another, he takes 100 rupees. if you dig ANOTHER, he takes ALL of your rupees.
so if you're really careful, you can dig 11 without paying him. just don't dig a 12th. also, when you leave the island and come back, you can do the thing all over again.
p.s. I found 2golden frogs in the bottom left quadrant and 2 in the bottom right, but does anyone know of frogs at the top left and top right?