how walkable is valletta between the main sights?

When exploring Valletta, key sights in the area include St. John's Co-Cathedral, Manoel Island, Hal Saflieni Hypogeum, Tarxien Temples, Hagar Qim, and Mnajdra. For getting around to these locations, the best seasons are March to May and October to December, when average temperatures range comfortably from 14.4°C to 22.5°C, avoiding the summer peaks of 27.8°C in July and 28.1°C in August.