Many tourists stayed on Rin beach from Monday morning to noon the next day before returning home.
The full-moon party this month coincided with the Thai New Year celebrations.
Wannee Thaipanich, chairwoman of the Phangan Tourism Association, said on Tuesday the party and other Songkran activities on the island and neighbouring Koh Samui could bring several millions of baht to the two islands.
As Koh Phangan declared the party a success, Prachuab Khiri Khan has opted for a different activity on its beach.
The Tourism Authority of Thailand (TAT) office in the province is organising a sand sculpture exhibition in Ban Krud, Bang Saphan district.
The Moonlight on the Beach activity runs until Wednesday, with artists and art students from King Mongkut Institute of Technology Lat Krabang joining local artists and children in creating sand sculptures under the moonlight on the beach, it added.
The exhibition was held for the first time in an attempt to promote tourism in the central province, the TAT office added.
Ban Krud is best known for the fight of local people against a plan to build a coal power plant in the area. The opposition forced the project to be scrapped.
Sand sculptures are being held at Ban Krud in Bang Saphan district, Prachuap Khiri Khan, to promote tourism in the province. (Video by Tawatchai Kemkumnerd)