Today we had a highly successful activity. Since the three boys had already done a rock collection, I didn't want to do that. I received an idea from round table about a penny collection.
I created a table, six by six and made "My Penny Collection." I started in the upper left corner and wrote the years in each square. I started with the year 1980 and went through 2010. There were a few blank squares left, so I typed 19___ and let them put pennies they found from earlier years.
At den meeting each boy received a roll of coins to sort through and glue on the appropriate square. They loved it! When my son got home he had to finish searching through our pennies to find the few squares that were left blank after den meeting. Because the pennies kept popping off, I stretched packing tape over them and then put the collection in a sheet protector.