Suggest some ways these conflicts could be avoided

Some roads completely closed and others can be closed except for local traffic.
This makes it more pleasant for other tourists.
BUT people in the tourist industry lose out as if you have a shop on a busy road, it will get more trade than a shop on a road which is closed to traffic.
Park and ride schemes can be set up to reduce congestion.
Car park sizes can be increased but this takes up countryside.
People can be educated e.g. signs: "please stick to footpaths"
Restricted on speed on waterways.
Limited building allowed.