Always buy shares in lake doughbegone. The best prices to buy at are $30-$50. Don't buy any shares at over $70.
Always dive in here at least 5 times in the 30 days, this can find a coin worth $1000.
These are the best places to visit;
EL CAPITAN -------- WHATSAMATTERHORN
NOVAY ------------- AYERS ROCK
VALLEY OF GOLD ---- THUNDERCLAP MOUNTAIN
BERMUDA TRIANGLE -- TRALALA
SWANSYLVANIA
Each of these should bring you a piece of the time machine. At the end of an expodition go straight to the stock exchange.