There is an invisible seam extending from the tunnel below the ground in front of the Farore's Wind fairy fountain. It is possible to walk up this seam and get on top of the fairy fountain. You can use one of two methods to clip into the fountain: a sidehop clip out of bounds followed by a jumpslash to access the fountain, or a jumpslash clip directly through the wall blocking the fountain.
Using precise movements made with the help of a shield, it is possible to navigate the invisible seam without ISG, which is normally helpful for preventing you from the falling off the seam. Video via @Venick409 on twitter: https://twitter.com/Venick409/status/1210473257318658048
Using a Deku Stick, you can access Jabu Jabu without using a fish and watching a lengthy cutscene.
There's a Silver Rock in Zora's Fountain blocking the way to a skulltula, which requires Silver/Gold/Coloured Gauntlets to lift. You can use a tricky Hookshot Jump with Iron Boots to bypass this rock.