Table 3. K-means clustering analysis.

No.	Topic	Clustering key tags (in descending order)
1	Scenic architecture	Fountains, planes, landscapes, beaches, swings, bridges, bands, cabinets, bathtubs, buildings
2	Gastronomy	Dish, restaurant, fish, durian
3	Nature	Beach, scenery, island, sand, cliff, shore
4	Beach photography	Beach, swimming costume, long dress, sand, beach trunks, wedding dress
5	Outfitting	Sunglasses, swimming costumes, swimming glasses, hats, long dresses, umbrellas
6	Diving & surfing	Diving, coral, swimming glasses, fish, jellyfish, beaches, speedboats