Boutique hotels in Palma are expected to benefit from American tourism.
No specific group has claimed responsibility for the anti-tourism graffiti that appeared.
Occupancy of city-centre hotels is at unprecedented levels.
Requests for new hotels in the city would mean a doubling of the number of accommodation places.
While there was an average 85% occupancy, some hotels had to stop selling for certain days as they were booked out.
Occupancy rates were high and so were prices - up to 350 euros a night.