I caught the RTA Marina Ferry trip from just outside the back of the Marina Mall. For 50 AED I thought this was exceptional value. The ferry takes a route around the marina, past the skyscrapers and up past the Palm Jumeirah to Atlantis, where it turns and returns. The views of the Dubai skyline were stunning. The ferry (Catamaran) was cool inside yet quite exciting outside when it went at full speed. Loads to see. Great value. Would 100% recommend. They do another route from Dubai Creek, which wasn't quite as scenic but still, in my opinion, worth the 50 AED.