Atlantis is brilliant - but expensive. Water park around hotel so lots of fun. Restaurants are buffet style but there is also Nobu there which is great. easy relaxing around the hotel in many pools. Quite a lot of families, but so much space you won't find it encroaching if it is a boys trip.
I think the hotels in Dubai are one of the main attractions, because they're so over the top. The Atlantis has never really appealed to me, but it is pretty impressive to walk through... grab a dirnk near the lobby area and people watch.