Depends if you have a primadonna or not. There was a horse at my last barn that after a conservative float he would stop eating and needed his feed soaked to mush and couldn't be ridden for a week. Every time. He was the biggest drama queen in every aspect of his life. I'll usually give a horse a day off.
As for gelding, you want to keep them mobile, either by turnout, buddies, or light work on the lunge/hand walking. Some swelling, filling, and some bleeding is normal, but keep an eye on it and communicate with your vet. Will there be flies out? Infection is a concern then. Some people cold hose, I don't know if that is recommended anymore or not. When my colt was gelded it was still winter.