Make sure you have adequate travel health insurance and accessible funds to cover the cost of any medical treatment abroad and repatriation. If you need emergency medical assistance during your trip, dial 103 or 911 and ask for an ambulance. As with any travel experience, eat well, but do not overeat. If you are dining with Armenians, they will feed you until you cannot eat anymore. The food is generally safe, even food from the roadside khorovats stands. There is little to worry about where food safety in Armenia is concerned.
There are people at the airport who ask tourists if they need a taxi and claim that it is an airport taxi which costs two or three times more than a regular taxi. You can find a taxi which costs 2,000-3,000 AMD. If you want to know whether a car is a real taxi, look at the number plate: if it is yellow or the first are 3 digit numbers (NOT 2 digit), then it is a taxi you want to take a ride in! While you are traveling in Armenia, you are subject to its laws even if you are a non-national. Crime against foreigners is relatively rare in Armenia. Yerevan, by any comparative measure, is a very safe city for its size (about 1 million people), and safer than most cities in a foreign country. Nevertheless, it is always prudent not to make yourself a target. In general, people are very kind and helpful. In summer you will see handful of people spending their evening at open-area cafes or strolling till midnight as well as many children playing outdoors.