Can't say I've found much of any value while riding. Probably the most interesting find was 20+ years ago: one beautiful day in mid June I was riding with two buddies on the beach on the firm sand along the waterline, when something cought my eye. At first I thought it was just an orange peel washed ashore, but something about it seemed unusual, so I stopped and went back. It turned out to be a roughly matchbox sized piece of amber. It is not unusual to find amber here, but it is usually tiny nuggets, rarely exceeding the size of a pea, and it's usually found in late summer and autumn, when the storms wash it ashore.