I didn't think of it as a particular achievement. If anything, I thought driving around Dubai was very easy! Renting a car was well worth it as it gave me a semi-private, airconditioned place to relax before checking into my hotel (my flight was arriving at around 1:30 a.m., there was no way I would pay a full night's rate or that the hotel would let me into my room at 3 for anything less).