Zelda: BotW Official guide sugests there are 76 side quests, 120 Shrine mini-dungeons, 900 Korok seed puzzles..

[t3mporary_126]

Will try to 100% shrines if they don't have too many barriers to them. 900 Korok seeds seem overkill. Hope they do something cool like MaiMai babies in LBW.
Likewise will probably only do sidequests that give bottles and item upgrades. Heart container rewards aren't as satisfying.