The thrill of rushing down trying to hit a zombie in midair then you suddenly hit the water with a big splash when yous hit the water and you see you see the underwater mansion you built towering looming over the dolphins with the beautiful aqauarium full of dolphins and fish. If you want to skydive first you need to build a pillar with ladders on it to a massive height and make sure you make the pillar by a large body of water so you can move around while you skydive. For more fun make the body of water you are jumping in at bedrock but it will take some planning to do that because you don't want to get trapped at bedrock layer. Also if you have elytra wings you can dive straight down which is super fun but will instakill you if you mess up. I did dive straight down when I first used elytra and it is really annoying when you just die.