Cornwall Council is also advising people to get tested before they travel to curb the spread of the virus.
It is asking people to order Covid testing packs online before travelling.
The latest statistics show Cornwall and the Isles of Scilly with 383 cases per 100,000 people, below the England figure of 525.
The council is asking visitors to "respect local communities in holiday hotspots".
It said as "tourist hotspots get more and more busy we're asking everyone to try and keep a distance between people and wear a face covering if a business asks you to as they are protecting their staff as well as you".
Visitors are advised to:
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