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Cycle along the Grand Canal to the Twelfth Lock Pub. Stop for some lunch or a pint. Then cycle through Castleknock (the only road part of the ride), back into the Phoenix Park doing a loop back to the start. Depending on how good lunch was, this could be a long or short loop.
Hazards and warnings
Twelfth Lock can be a hazard if you stop there for too long. There is a short road traffic ride after the stop. Alternatively, reverse the route and you will have a leisurely cycle along the Canal after the stop.
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