When I stayed at the Holiday Inn - Miami Portside Hotel, there were a few evenings where a pizza delivery menu flyer was posted through my day. I've heard that these are not genuine companies, what happens is that when you phone to place our order, they take your credit card details for fraudulent use. I don't know how true this is, but better to be safe than sorry.
If staying in hotels, beware of touris class, they are the pitts. Also watch out for strangers following you around, we had a couple of youngsters follow us off the beach but stopped short as we went into a bar with plenty of others.