What to do with one day in Edinburgh - for free & avoid the tourists

Avoid the crowds, noisy guides, selfie-snappers, tourists coaches and the like. These activities are free as well.
For a great overview of the city and environs, climb Arthur's Seat in Holyrood Park (at the east end of the Royal Mile).

Trails start near the car park, there is a visitors centre with free maps

Free guide with map

View from the summit, 252 metres above sea level

The Museum of Edinburgh (Canongate, close to Holyrood Park) has rooms of fascinating exhibits (don't miss Greyfriars Bobby's dog collar and bowl) in a historic house.

Visit Greyfriars Kirk (off Grassmarket).

The National Galleries of Scotland comprises 3 galleries - all free, except special exhibitions.