Hey Shells, I'm a 32 y.o. Canuck also living in Abu Dhabi since September 2008. May I ask what brings you here?
Anyway, I think there are a few things you should know off the bat. First, this country is pretty nice to live in, no doubt about it. But don't be fooled into fairytalish thinking. Be prepared to be extremely frustrated for the first few months until you are settled and used to what you have.
You can forget about the little comforts of Canada, like online shopping, or helpful salespeople, or real sales, or cheap good meals, etc. Forget about common courtesy or pedestrians first. These are old ideals you will only revel in when you go home to visit your folks (as I'll be doing in 2 months).
Of what I listed above, the most important is road safety. Ok, driving here is stressful! People all speed, from scooters and Nissan Tiida's to V12 Mercedes. People will not let you change lanes even if you signal. You have to become aggressive fast, or they'll eat you alive. You have to keep your eyes open all the time because danger is lurking at every corner.
If you for some god-forsaken reason need to walk, pray. No seriously, be very very very careful crossing streets, especially watch out for those that are doing U-turns at the traffic lights, and those making a right at the separate "make a right only" lane. They will not stop for you.
When it comes to shopping, I honestly don't buy anything here when it comes to clothes. I save it for my trips to US or Canada. Nothing beats the prices there. I buy essentials here, such as furniture, electronics, etc. Be prepared to be shocked by how much everything costs compared to North America. Piece of advice: Stop making comparisons. If something here is not 30% more expensive, then it's not expensive. Salespeople are completely useless. If you are looking for the latest LCD TV or new stereo, do your research online, write down the brand/model you want, and go buy it. Don't bother ask employees for recommendations. They all work on commission and compete against each others in the store. I heard it many times "don't buy this, it's crap, buy this". I once got fed up and told him "how would your manager feel if I told him that you are denigrating his merchandise?" and left. The only information you will get from salespeople is what's written on the price tag/info sheet. They will literally read the features to you and not add anything past that.
OOOhhh perhaps even more important than anything is HAVING AN APARTMENT. make sure 100% that your company is providing you with a place to live... a DECENT place to live. Finding living here is very tough. I have colleagues who have been living in hotels since August.
Parking in this city is HORRIBLE. Where I live there's absolutely no parking. If I go out at night, I usually have to wait for an hour to find parking when I get back home. So this usually deters me from venturing out of my place when I find parking.
When it comes to grocery shopping, places like Carrefour and LuLu have pretty much everything you would expect a big Canadian supermarket to have.
If you are buying fruits/vegetables, you have to get into the habit of weighing them at assigned weighing stations because they don't weigh them at checkout like we are used to.
Marina Mall is probably your best bet for shopping here. It has a big Carrefour, and countless stores inside. Avoid the Abu Dhabi Mall area like the plague because of neverending construction. Khalidiya mall is not bad, and not too crowded.
Some supermarkets have pork sections for "non-muslims only". However unfortunately someone thought it would be funny to play a joke on us and shut down all pork sales during the swine flu crisis, so no eggs and bacon for me for a while.
Some good places for eats are at the many 5-star hotels. That's where you will find your bars and alcohol as well. Most of them are along the corniche area (the coastline) on the Abu Dhabi island. My favorite is Shangri-la hotel, which is just outside the city. It's gorgeous, and so much fun to hang out there. Has amazing restaurants too!
You can buy liquor at specialized liquor stores (kinda like Ontario hehe) but you need a "liquor license". Your company should take care of this for you. The selection of alcohol you can buy here is not bad actually. Piece of advice: Stock up at the airport as you are coming in. You are allowed 4 bottles I think. Really, stock up... believe me. You will need it when you are stuck at home because you don't want to lose your parking spot haha!
One thing you won't find here is an inviting coffee shop. Sure there are plenty of starbuckses and whatnot, but no atmosphere. I guess you'll know what I'm talking about when you see them.
There are always cultural events here, concerts, exhibitions, sporting events, so you won't get bored. But you really have to buy your tickets early, and you have to look for these things. Just stay tuned to Radio 1 or Radio 2 and they usually have the news.
Bars wise, we usually go to Jazz bar at the Hilton, Hemingway's which is a pub at the same venue, a few bars at the Intercontinental, or to Pearl and Caviar at the Shangri-la.
Dubai is 1.5 hours away, and it's sooooooo much fun. It's like a different world. I try to make it there on weekends. Really a pretty city. Those that live there don't seem to agree, but for us weekend tourists it's just wonderful. It's a different world of class.
Oh and as someone mentioned before me, the beach is pretty nice. The corniche area has public beaches that are very well maintained and friendly. The beach is split into a single men section, and a women and families section. I guess it's to keep the perverts out. They all have security personnel, lifeguards, and cost only 5 dirhams to enter (1 US dollar = 3.68 dirhams, it's a fixed exchange).
Anyhow, I don't mean to frighten you. I truly enjoy living here, I just want you to be prepared mentally to what you are about to face. Anything you need, do let me know.
Peace!