Countries like Thailand and South Africa are slowly opening up to marijuana tourism, a multibillion-dollar industry. But others want to avoid Amsterdam’s problems. Amsterdam has dominated cannabis tourism for 40 years, but now it’s stepping back from this multibillion-dollar industry, creating opportunities for emerging marijuana destinations in Asia, Africa, and the Americas. New rules in the Dutch city’s central tourist area limit alcohol sales, require bars to close earlier, and impose a €100 ($107) fine…