1.Budget.work out how much cash you got then divide it by how many weeks,then put in envelopes for the week and only spend that much money.I know its easy to go all wooooo!! america everythings cheap,its not.
2.All you can eat buffets fill yourself as much as possible untill you cant walk for 5 or 6 bucks and be good for most of the day.In america this is cheaper than buying food from the grocery store
3.Water.Tap or free soda refills from a free water cup.Dont die from dehydration
4.Pay any tolls in loose change they probably cant be bothered to count it out,so give less.
5.Clean up,if your stopping at someones at least have respect,clean there mess aswell.
6.Save some money for emergencys but make sure you spend it all at your last airport before the USA,no point take dollars back to england.
7.Make sure you stuff your bike/music/what ever box with sleeping bags,clothes because they actually throw the box(i witnessed this) this could either damage your stuff or burst the box open from all the loose stuff,and they wont bother to tape it back up nether.
8.Use too much duct tape.Cheaper than a proper bag and stronger than the cardboad.
9.Dress like a dork at immigration and talk posh,theres no need to draw attention to yourself,friends have been intrregated for carrying camera equiptment and questioned in "special"rooms
10.Be Nice.its amazing how helpfull people can be,when you dont be lame,use your accent to your advantage if you must....