When you enter the hotel, until the check-in procedure finishes you can connect to Wi-Fi with the password for the that day which will be given to you. This password is updated every day. Until next day, you can use this password. After your check-in, you can use your room number and your birth year (e.g. your room number is 2302 and your birth year is 1977, your Wi-Fi password is 23021977) as a permanent Wi-Fi password till the end of your holiday.