Turkey is generally safe for tourists, but the situation varies by region. Istanbul, Cappadocia, the Aegean and Mediterranean coasts, and major archaeological sites are well-touristed and have a solid safety record.
Border areas with Syria and Iraq should be avoided. Occasional political demonstrations occur in major cities — give them a wide berth. Standard urban precautions apply: watch for pickpockets in crowded markets and tourist areas. Check your government's travel advisory before visiting.