I seen this with another player so I tried it out. This is how to get inside the hotel GO HERE LOCATED ON THE MAP THEN YOU WANT TO FIND THIS PLACE TO THE SIDE AND RUN INTO THE WALL AS SHOWN ON THE PICTURE THEN RUN INTO THE WALL AND YOU SHOULD BE INSIDE THE HOTEL PHOTOS BY ME Hope you enjoyed this little glitch an I hope it helps you mess with some players online! .
I completed the story in a weekend and feel a bit empty now done all the side missions but cba with the mini games though too much effort