im about halfway through the snow temple. just hit 25 hours today. Im not looking for bugs (i should be, i'll do that later) but I have gotten every heart piece so far.
you have to go find the zora prince at the graveyards, show him the picture and he'll give you a fishing lure. Warp back to the zora lake place, and look for one big rock and one small rock protruding out of the water next to each other. Fish there and catch one of the red reekfish, turn into a wolf, and then learn the reek scent. Then head back out towards snow peak, following the scent.
you have to go find the zora prince at the graveyards, show him the picture and he'll give you a fishing lure. Warp back to the zora lake place, and look for one big rock and one small rock protruding out of the water next to each other. Fish there and catch one of the red reekfish, turn into a wolf, and then learn the reek scent. Then head back out towards snow peak, following the scent.