At 251 m above sea level, sitting in perfect balance across the city from the castle, Arthur's Seat overlooks the city, river and seashore offering breathtaking views across the Lothians and giving Edinburgh its dramatic skyline. The edge of an ancient volcano and a popular destination for all who feel the need for some exercise to take the approximate 45 minute climb to the top it is also site of Special Scientific Interest with diverse range of flora and geology.
Other attractions in the 2.5 square kilometre Royal Park include:
An ancient well preserved fortress and the finds of stone and flint tools provides evidence of human activity as far back as 5000BC. 
Salisbury Crags - 50 metre high cliffs
St. Anthony's Chapel - a medieval ruin
Duddingston Loch - a fresh water loch with a variety of geese and other birdlife
The Visitor Information Centre is located opposite the Holyrood House Palace. Snacks and souvenirs are available there as well as information about walking and biking trails as well as the history.