good auto-surf traffic exchange?

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Anyone know of a good one? I usually completely ignore them, because people can use them without ever looking at the screen - which doesn't help me usually. But I realised today that one of the sites I use gives me money just for people visiting my referral link, not necessarily signing up. So I figured if I throw it on a traffic exchange that has an auto-surf option, I'll get a lot of hits. The problem is that the few auto-surf sites I've tried in the past like to surprise me with potentially dangerous files randomly downloading to my computer from sites that I don't notice I'm visitng. So I thought if I asked around I might find a safe one.