Terceira is really a dangerous place. Especially if you hate cows. Apparently these lovely animals tend to cross in your path once in a while blocking your progression. Also goats and other similar animals might appear everywhere. Don't trust in their peaceful faces! If you do like cows and goats another danger of the island might be the parking fees. Oh yes, all Angra city centre is full of devilish machines that charge you money for your parking. If you are not up to it there is a big parking lot near monte brasil where you can park your car for free. If you are not not afraid of cows or parking tickets then I guess you are quite safe.