One of the first sights I saw after arriving in Florida was a strange bus with a duck on it that kept making duck noises. A quick search on my phone yielded a website with many positive reviews for the Duck/Pirate tour. Two themes with this travel company are the Duck tour and the Pirate Ship tour.
The bus is a land and sea bus and will take you around Miami and then in the water as well. The tour becomes extremely popular in November and there are often large lines. It was a lot of fun and great to see the homes of the rich and famous (I saw Lisa from real Housewives’s home). My only recommendation is to sit near the back and bring ear plugs if you are sensitive to sound as it can become noisy near the front of the bus.