I played Dungeons and Dragons with friends. That was fun. We found a note in our first session that we couldn't read, and it later turned out to say April Fool's. (One of our players lost their original character in a fight too, so he had to make a new one, but that wasn't an April Fool's joke. We got a good laugh out of it though.) That was the main part of my day though.
Forum wise, on Petalburg, the staff changed their names and we renamed all the boards. I'll be adjusting all that back to normal on Monday when I have a free day again though. The RPG community I'm in, we just changed our names since that's based on Discord.
I don't care much for the holiday because the nature of it for the most part involves abusing the trust someone has in you for your own amusement( It should also leave one to ask themselves why they find the act of successfully deceiving someone as something to find joy in) and I don't think that's something a person should be doing which is why I don't do it. Trust is a thing of immeasurable value and should not be something that is trifled with.