Best Gold Mine
At the arcade in any town the goal is to reach 1000 pt. If you do, the lady will tell you the spot of the best gold mine. The mine is located the hills above the west bank of Eldorado Creek. or you can choose Above Bonaza Creek #1, Then stake it immediately. You should receive lots of money.
If you sell your diary to the news lady, she will give you $20 in gold. Don't worry she will return your diary to you.