One great site to invest bitcoin is giftobit. Invest small amount 0.06 BTC one time and secure spots in bitcoin earnings. Plus for this investment you will give 20+ videos whit hours and hours of video content about crypto currency and bitcoins in general. Trust me it is worth every μBTC. Join from my signature link and I will guide you to setup all.
I never look for any investment opportunities that too without any proper recommendation from reputed people. I believe there is no need to look for any other investments similar to bitcoin mining. I believe only with bitcoin investments as it has unlimited opportunities to bring unlimited returns for our investments.