1)Jump up to where the blind skull is (jump on the lights in the hallway where the grunt is)
2)Turn around and you will see a ledge to the left of where you just jumped from.
3)Jump over there and grenade jump up on top of the ledge
4)Walk to the right on the ledge and you will see your crash site on the left. Continue until you hit a barrier. Don't worry as it will let you through.
5) Jump on the platform to your right.
6)In front of you there are a series of ledges, just keep walking on them, jumping/crouching when you need to.
7) Eventually you will see a bridge. Take a running start and jump over on it, then over to the other side, where you will see Hotel Zanzibar.
And there you have it, an easy way to get to Hotel Zanzibar

P.S sorry if this has already been done
