I'll be visiting Lisbon, Portugal for a friend's wedding from April 27 through May 2. I'd be happy to meet up with anyone in the area, and perhaps do a key signing. While in Portugal, I'll be using WhatsApp (so I don't have to get an international calling plan) and email as the primary means of communication. Also, anything that's a must do that isn't a tourist trap? And, how likely is it that I'll be robbed? I'm asking for my wife.