The game is very similar to this except it's impossible to do it all in 90 seconds here.
Rules are simple: starting person makes a scenario and starts a sentence with a letter. The next person starts another sentence with the next letter, the person after that does the same and so on. When we eventually reach the starting letter, the person who hit that letter creates a new scenario, picks a new letter, and it starts over.
Example: (starting letter = B, scenario = the office building's on fire) Person 1: "Bring me this month's financial reports." Person 2: "Can't you see the building's on fire?" Person 3: "Does it matter?" Person 4: "Everyone else is evacuating."
Ok now it starts Scenario = You're on the Titanic when it crashes into the iceberg; Starting letter = J
Xerodermia (dry skin) could be cured by the rainwater, but the wet sand could slow our rate of travel. If we get stuck, there's also a higher risk of being attacked.
It's simple. I've been through those 'assages' before and I assure you it's not pleasant. Dangerous monsters lurk there for those foolish enough to enter. Every other secret passage is the same.
Just another reason: although it would shorten our trip, it's over rough rocky land. The camels would probably break their legs and we'd be stranded halfway to the passage. There's no water or shade either. At least the current path is relatively flat.