I would recommend to see some alligator farms on Tamiami trail, go to see Key Biscayne, and visit Las Olas boulevard in Fort Lauderdale at Saturday night.

And try to get some Cuban food outside the South Beach. :o)

I enjoyed the Wolfsonian, which is just off the beach.

Avoid any of the restaurants and venues on Ocean Drive such as the Clevelander other than taking a stroll during the day to check things out. The Delano is lovely but expect to pay $18 per drink with no place to sit down. It is also jammed with tourists. I recommend seeing it during the day. Lincoln Road is where you will find better restaurants and less tourists than Ocean Drive (at least of the frat kind) plus tons of great restaurants and shops. The further you get from Ocean Drive, the nicer it is. Espanola Way is also lovely with restaurants, shops and atmosphere plus historic architecture. Joes Stone Crab has a carry out and their food is actually fabulous. Grab your carry out and head over to watch the cruise ships sail out starting at about 4:30 pm. For classic Cuban food, head for Versailles in Little Havana. Any cabbie will know where it is. Remember that renting chairs and umbrellas on the beach is very expensive. Bring your own beach towels. Regarding nightclubs, there are lots that have excellent djs because Miami is a locus for talent without the lines, $20 entrance fees, and $15 drinks. Do some research online and you will find lots of sites recommending clubs.