Well, you've sat around on your duff for long enough. It's time to get to business.
Head to the waterfall, wait the requisite 180 seconds, then infiltrate the base. Fight your way through to the evil master and depose him post-haste.
Then, take a dip in the hot spring to wash off that funk you picked up. Head into the nearby cave and claim another power spot as yours.
Once you're done, sit back, have some coffee with a Mr. Saturn, and then save your game.