The best site that's a must is http://www.visitdubai.com/en
This site is maintained by Dubai Corporation of Tourism and commerce has all the details relevant for the travelers from Visa, stay to sites that are must visit inside dubai and the discounts that are available
The Best things first
1. It has a beautiful travel tool i.e Trip planner ( the best thing is they have an app too) which helps you to plan your trip itinerary and add it to your mobiles. Carry and tick mark things that you have visited and check the information about the places that you plan to visit on the go!. Cool.
2. The advised trip itinerary based on number of days of your visit. The normal question anyone has what to see first and what to experience next? and that too when your time is limited. The basics anyway are there to be covered ( Burj Khalifa, Gold Souq).. but the advised trip planner as per number your number of days of visit will ease your tensions and will give a jump start to your planning.
3. The discounts and the event planner links. Dubai is all about shopping and shopping and discounts go hand in hand. Check out the best discounts available and keep them in handy.. These discounts are for your stay, eat, relax,enjoy categories and will ease the burden of taking out your pocket every time. Enjoy your experiences and avail discounts .The events planner helps in checking what's running at the time of your visit be it a motor show or a GITEX
Now to areas of improvements
1. The site has heavy images and videos. So may have trouble on low bandwidths for opening up
2. Some of the links are not working ( esp the business set up ex. http://www.visitdubai.com/en/business-and-investment_new/business-culture/living-in-dubai)
which means the testing is not done properly..
Overall based on the content and helpful information , I would rate this site 4.5/5
Visit : http://www.visitdubai.com/en