When hatching, top of the mountain with the blue obelisk (whitesky peak), with 4 standing torches works to keep the eggs at the perfect temperature, day through night.
Wanna get Wyvern eggs? Use one of these with a whip and you'll get so many eggs you'll end up with so many omelettes that you don't know what to do with them
While diving pull up at the last second above your target and use main left click attack. Does a ton more dmg then just landing on target. Gives a nice speed boost too.