you going to have a blast, i lived there for 8 years and visit 1-2 times a year. as for tips, really depends what you into man ! DXB is like Vegas on steroids! you can do whatever you want, TONS of activities, restaurants etc. how many days are you there for?
Make sure you go to Burj Khilifa, buy your ticket in advance as it gets super busy during SunSet.
Palm island is a must, if you like water mark the water park is good, but if you wanna go to main one, you need to go to Yas in Abu Dhabi.
Ferrari land is also in Abu Dhabi, do the desert safari , dont cheap out, go with a proper tour, if its like 30$ per person, its shit!
One big advice, DXB is NOT for everyone, you need to be ready to spend money to have fun, things are expensive, but the city has LOTS to offer for those who can look beyond certain things !
if you wanna know anything specific let me know, would be glad to help.