The most promising opportunity to make money from Bitcoin this year is arbitrage. If you aren't familiar with the concept of arbitrage, it is actually quite simple - it is when you take advantage of a disparity in prices between different markets to buy at one price and instantly sell at a profit in another market.
Today there are huge differences between the price that Bitcoins sell for on the different exchanges. The wide divergence of prices means that you can get involved in arbitrage yourself just by having accounts on multiple exchanges with a balance in multiple currencies in each one - so when an opportunity arises you can simple buy and sell immediately without having to transfer funds between accounts.
The risk in doing this, of course, is that the price will change between when you buy and when you sell. This makes arbitrage highly dependent on the speed at which you are able to make transactions. Also you need to be sat in front of a screen watching price feeds constantly to find an opportunity. There are a number of Bitcoin arbitrage funds which you can invest your money in. Generally these funds will publish their results and pay out profit daily.