The German government advises against trips to lebanon unless you have important business or family matters to attend and recommends to stay well clear of political gatherings and the south of the country. It seems a bit exaggerated especially as the ongoing protest by Hezbollah and their allies in downtown is about the most peaceful demonstration i have ever seen. Most dangerous thing that has happened to me was being forced to sit down with a couple of Lebanese teenagers from boston to smoke the narghile and look at their phone screen-savers depicting Nasrallah in x-thousend different poses:

For the rest you need some tolerance towards armed men, as there are soldiers in full battle gear almost everywhere, plus you might want to consider not getting too drunk with all the razor wire on the sideways. At many times the army presence borders the absurd especially when you step out of one of the bars in rue Gourand and are suddenly in the middle of 10 battle ready soldiers patrolling both sidewalks and forcing the party crowd to step into the street risking to be run over by the endless column SUVs crawling down the road. So unless you are a giant pink rabbit or a chick that likes sitting on giant white rabbits you are probably safer in beirut than in berlin: