If you go to where you acquired the Ice Rod,you can find a secret.Instead of going inside the hole on the left,Go into the hole on the right.(when i say "hole" i mean cave)You will find in the second room a statue.Use your Pegasus Boots(You did get those right?)and ram the statue,a bee will pop out.Do not despair!This is a golden bee........He can help you.

HA!Now catch the bee and take him to that guy that sells you a bottle for 100 rupees and let the bee loose.The man will give you a variety of items or 20 rupees.
NOTE!:This can only bee done only once.
Also,once you dry up the pond in order to get to the 2nd D.World you will see a fish.If you pick the fish up and throw it into the nearby FULL lake,the fish gives you 20 rupees.Albeit,if you bring the fish to the guy whom you brought the bee to,he gives you a variety of items or 100 rupees.
At the note of a member: BigGoronSword,Mothula can easily be killed using The Good Bee or the average bee.(plz bee helpful!)
Note from Big Bro Davida,You can reflect magic attacks with the bug-catching net!
NOTE!:THIS can only be done once as well!
NOTE!:These somewhat secret secrets are not completely official!
P.S:The guy who gives you the bottle lives in Kakariko village,right by the bird statue!