The 19-year-old flew into Phuket two weeks ago and headed for the picturesque island of Phi Phi with a group of 15 girlfriends and two armed guards.
Her party hired a block of 12 rooms at the £48-a-night Phi Phi Villa Resort, close to beautiful Tonsai Beach.
Dancing Queen: Princess Beatrice partied on the beach
Each day she swam with her chums in the local bay and partied on the sands.
Last Saturday night, Beatrice's group headed to Koh Phagnan to enjoy one of the island's notorious "Full Moon" raves.
A tourist was stabbed to death at that party, although it is not known if Beatrice was aware of this.
Party Island: Backpackers drink and dance on the beach
The parties attract thousands of young travellers each full moon and have been the subject of Foreign Office warnings following a series of rapes and deaths.
Back on Phi Phi, the Princess's favourite spots included the British-owned Tiger Bar and a Thai-run beach bar called Hippies, where backpackers dance under candlelight on the beach.
Philip Osman, 26, of the Tiger Bar said: "Beatrice certainly knew how to party. She was up there dancing and encouraging others to join in.
"She was drinking by the bucketful. She bought a bucket which she filled with Thai whisky, Red Bull, ice and coke. But I did not see her drunk."
A spokesman for Beatrice said she would not comment on a private trip.
Buckets of booze: Drinks for sale on the beach in Phi Phi
