One advice I would give is that if you are a platinum or have lounge access, request to have your room be allocated in the same tower as the lounge.
If not, you will have to take the elevator down to the ground floor and transfer. Given the height of the towers, this can be a time consuming annoyance.

There is also a regular shuttle bus from the hotel to the Dubai Mall (one with the Dubai Fountain and photo spots of the Burj Khalifa etc). Comes in handy! (many taxis are often not thrilled to take you a short distance to JW Marquis from Dubai Mall as they often wait a long time to take passengers.