I live in a country with exchange control, and is practically impossible to obtain dollars.
The only alternative is to buy stocks, shares, etc with a credit card whether by internet or personally in a place easy to go as Miami.
What opportunities are available?

If you can find a brokerage company willing to take the settlement via credit card, go for it.

As a side note, you should take into consideration your rate of interest on your credit card compared to when the investment will begin to make a return.

Be sure you can also afford to pay a substantial amount above the minimum of the principal every month or you could be setting yourself up for a financial trap.

Another investment opportunity is ethanol plants. The article below while not speaking directly about private investing, it will shed light on the future of ethanol plants.

Virgin in the Oil Patch - February 06, 2006 (http://money.cnn.com/magazines/fortune/fortune_archive/2006/02/06/8367961/)

Best Wishes!