If you know what is good for you, limit the money that you bring.

I actually go with a shopping list, and budget to pay what I think it will cost to fill it, and maybe a $100 more for mad impulse purchases.

I was out on a camping trip with my sons Cub group on the weekend and took two different cameras. One of the kids noticed the second one and asked how many I had. I had to think, and said 'oh about 20-30 or so'....