Totally just beat the Fire Temple.
That one was kinda confusing, because I didn't know you could jump up to the platform with the locked door in that one room where the wall of fire chases you.
Also, the boss was really easy until it was down to one hit, and then it would attack almost immediately after popping out of the ground. I got lucky after a few minutes and just barely managed to hit it the final time before it hit me.
So that's 2 out of what, 6 temples down?