Dubai is way more liberal than most Islamic countries. There are no concrete laws in Dubai that forbid anybody from wearing any kind of clothes but being a country with conservative values, it is preferable and respectful to wear clothes that cover the shoulders and knees. The nightlife is quite happening and you’ll find expats and tourists drinking and canoodling in the many bars and clubs in the city. There’s even a healthy gay community in Dubai! As long as you steer clear of cultural insensitivities, you’re good to go in Dubai.