I don't do anything special post ride for cramps specifically. Whether I felt a cramp during the ride or overworked myself during the ride. I do always hydrate well during and after the ride. I've had few issues with cramps from riding for quite a number of years now.

However, just the other night, I was sitting watching TV, and got a slight cramp in my foot that wouldn't go away, though it wasn't bad. My wife said to eat a banana. I did, believing it would be too little to late. However the cramp went away. And when she ask me about it a little later, I had to admit that.

But perhaps it was just me getting up and walking into the kitchen that provided the relief or perhaps the cramp's time had come and gone on it's own.