If it hadn't rained we would have tubed and ziplined, but instead we just tendered into the port to check it out. Wasn't very impressed. Don't bother unless you have an excursion. Most excursions also included long transport times due to the fact that there isn't anything in Belize City.
After doing some research, I found we could walk to the same beach that is offered as an excusion for about $60 a person for free. Free chairs on the front row beach front. The beach is very nice and offered reasonably priced meals. The port was very clean and nice.