This is book number 77 in the Geronimo Stilton series.
THE LAST RESORT OASIS
It was a cold winter in New Mouse City when my grandfather William Shortpaws decided to take the whole family on vacation! We all climbed aboard the cheese-colored camper and set off on a relaxing retreat. But we took a wrong turn and somehow I found myself trying to round up a caravan of spitting camels. Could I get them all back to The Last Resort Oasis?