I would invest my bitcoins in an offline or real world kind of business. The only problem is that bitcoin is still not well known and that when investing it in the real world no one will accept it.
Of course, you can exchange it first into cash and invest or use it in offline business.
As for me, I'll open some food business or convenience store, something for everyday needs. Real time investment while having online investment is a sure ball thing.
If you have a lot of bitcoin you can open any project including offline business.
You know bitcoin is rising countiniuosly and if you invest in both you will get double profit.