Cascais generally presents a safe environment for solo female travelers. The crime rate is relatively low in comparison to larger cities. However, as with anywhere, it's still important to remain vigilant, especially at night or when in less crowded areas. Locals are friendly and it's a common destination for tourists, which means you're likely to find help, should you need it. Due to high levels of tourism, locals speak fluent English. But remember, always keep your belongings secure at all times.