The "Love Boat" study tour is held in the summer between June and July, so as to allow students to attend during summer break. Summer in Taiwan is very hot and humid, in particular to non-natives, so none of the study tour participants would be wearing jackets, sweatshirts, etc.
While certainly changed for entertainment purposes, the actual Loveboat program took place at hostel/communal accommodations, not a 4-star hotel.
At the party at the Grand Hotel, Ever makes her entrance from the upstairs down the grand staircase. The front entrance to the hotel actually would take her through the party and up the staircase, before she could come back down, so the guests at the party would have seen her enter and interacted with her already.
The Loveboat program in the film takes place at the FAB Hotel in Danshui. From the hotel, overlooking the river is Bali District, and the Taipei Port Container Terminal. Taipei 101 is not visible from this vantage point, but the filmmakers have superimposed it in.
The Loveboat program in the film takes place at the FAB Hotel in Danshui. When the bus from the airport is taking the group to the FAB Hotel, they are seen traveling north on National Freeway 1 past Taipei. In that shot, they have already passed the exit toward Danshui, and are traveling further away from the FAB Hotel.