On my first trip I bought a big Muppets money box from the shop at the end of Muppets 4D, and put spare change in it, but also every time I get a £2 coin in my change it goes straight in too. Will start doing the envelope thing though, I like the idea of being able to see the envelope for say a character meal and then Im less likely to raid the money box for lazy decisions (e.g takeaways instead of getting my husband to cook )