Completely agree with the above. There is a million and one things to do in Dubai. whether you are in to outdoorsy activities or beaching, lounging around and Bars and clubs
January is perfect as teh weather is very good.
I would add to thelist above
Friday Brunch at the Yacht Club Dubai Marina
Evening dinner at wafi gourmet Dubai mall..outside table where you can see the fountain. order homous tabouleh Labneh with Garlic, fatoush, grilled haloumi and shish tawouk (grilled chicken) AMAZING!
skydiving over the Palm
Go Karting at motor city
all you can eat and drink Buffet at The Terrace Le Meridien(near airport) 40 E for great spread and outdoors great venue
Two water parks one at teh Atlantis Hotel and the other Wild Wadi, both very good
if you want to get away, there are other Emirates. Cove Rotana Ras al Khaimah is a brilliant resort
Fujairah Al Aqha beach resort is also good
in Abu Dhabi don't forget Ferrarri World
Any negatives are people who have been on holiday without consulting people who live there, all our visitors always say "we would never have known about these things if we didn't come with you"