Tourism is relatively big there but only relatively to the population numbers. I'd argue gambling contributes more to the GDP, while tourism only keeps the light on on the economy. Tourism allows the citizens to make money but it's a small country so it doesn't scale. Gambling scales globally.
Tourism scales globally in the same way unless you mean the island would be at 100% occupancy rate already. Also my point is it's hard to trust you when you ignore the top export while talking about exports.
I have no numbers to back this up.