What about collecting pressed pennies instead of pin trading. You could bring a roll of quarters for each for the machines. One thing about pin trading is that the best finds are in the morning, which is prime park time for non-serious traders. Which isn't to say that first time traders won't enjoy finding a few things later in the day, but it can get old quick. Then the start of your day becomes about the trading hobby and not rides as you get more into it.