OH MAN THIS IS THE BEST QUEST IN THE GAME.
I had just finished the Zora Divine Beast, and wanted to explore a ton before I moved on. I wound up on the southeast shores of Hyrule. I put two and two together (without being told) and figured out how to use a Deku Leaf and a raft, and I went out to an island in the distance. I finally got on the shore, really excited to find what I assumed was a shrine when... well if you haven't done it, go do it. It was something that only this game could have pulled off so well, a mico-desiged dungeon with such a density of secrets and the hand of a designer lovingly easing you towards solutions to puzzles. It was such a change of pace from the rest of the game and reminded me of my ventures 10 or so hours before.
I failed the first 3 times and gave up. After every Beast I took down, I went back and failed. Finally, I got the Gerudo beast, my last one, and kinda brute forced my way through it haha. But loved it so much, and the flying mini-game after you beat it was a load of fun.
While I do like the concept of that Shrine Trial, it wasn't really difficult to handle. At first, I was like ... yeah no weapons and shit; but looking around with M agnesis I quickly got geared up and with a bit of help from Stasis, it wasn't too difficult to get rid of the enemies. I was unlucky enough to have my first "Test of Strength" shrine be a "Major" one ... so by the time I got to everything else, the battles felt like cakewalk. These days I'm so OP, I casually stride along hunting for Silver Lynels. Once you get used to their attack patterns, you can pretty much kill any mob without taking any damage. Still ... my favourite thing has to be Talus grinding. I just love seeing 40+ diamonds in my pouch, knowing that I'll be ridiculously rich soon.