I have to disagree with my friend Paul on coin collecting. It's not a lost hobby, it's still lots of fun.
I own several coin collections, and enjoy updating them and sharing them. The Franklin half dollar is fun to collect and relatively affordable. I inherited an incomplete collection and have been filling it in slowly over the years.
The current Silver Eagle series is also a wonderful issue, beautiful, historical, and readily available.
The State Quarter issues were beautiful and educational as well. I am proud of my complete albums of uncirculated issues from both the Philadelphia and Denver mints. Now on to the National Parks series!
Sure, you're probably not going to pull a super-valuable coin out of circulation. But the truth of the matter is, you were probably as unlikely to do that in years past as you are today. While Paul looks for Wheaties, his parents probably looked for Indian Heads. Now, most of those Indian Heads are worth about a dollar, while the Wheaties are worth about 75 cents. Nobody is getting rich collecting pennies, but we are sure having a lot of fun!
The people collecting super valuable coins were rich in some other venture prior to collecting these coins. For the rest of us, coin collecting offers the same level of enjoyment, albeit centered around less perfect examples of the very same coins. It's the most egalitarian hobby I can imagine!