A great way for you to relax and get a breather would be to visit the Corniche. It is really one of the cheaper and best things to do in Abu Dhabi. And it also gives you a great vibe of the city. You can walk, jog, surf, take a Kayak, or cycle or just sunbathe and read a novel. For those who can afford it, beach clubs that offer you everything from a spa treatment to gourmet meals and drinks are available.