BitBond is a P2P lending site where you loan to people and earn pretty decent interest too,haven't tried it yet but Ive heard good things about them.
also if you choose to invest with them try to find people with lots of repaid loan. Higher chances of you getting paid back
You have not tried it that is why you are suggesting for it, first try to join it and try to lend your bitcoins at there after that you will not suggest for that, at lending sites you will often face scammers who will default you and the other point is that you will not get a pretty good interest but that amount is much lower relative to other investments.