why are the guests surprised when they arrive on the island?

The guests are surprised when they arrive on the island because it appears to be a luxurious and idyllic setting, yet there is an underlying sense of mystery and foreboding. They find the isolation unsettling, as there are no other people around, and the hosts are notably absent. Additionally, the strange circumstances surrounding their invitations raise suspicions, making them question the true nature of their gathering. This contrast between the beautiful environment and the eerie atmosphere creates an unsettling surprise for the guests.