Four years after the dreadful floods of 2009, it has cost more than four million pounds to replace the hundreds of bridges and pathways that were destroyed.
Cumbria's "Paths for the Public" programme has restored access to the areas cut off by the flood damage, and helped to bring back tourists.
Andy Burn has the full report below.
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The historic event always takes place on the last Friday in July.
Early enquiries suggest the men may have taken the drug Blue Valium. Two of them remain in hospital with breathing problems.
More than 8,000 people are expected to attend over the three day event, which starts at 7pm tonight.