Whenever I have a few moments to kill, I log into the Port Everglades live web cam (see posting of 11/30/2011) that shows the arriving and departing cruse ships, but also anything else of interest in the port. The evening views just before dusk are especially pleasant with the pleasure boats leisurely returning into the setting sun. It is as if I am living close by and took a short walk to the dock to see what is going on. Sometimes nothing, but sometimes something very interesting. Once, it followed a submarine on the surface coming in the channel. The view of the captain standing in the conning tower was clear enough to recognize him if I saw him on the street.
The live view is high definition and it looks reasonably good full-screen. Scroll down and you will see a Google Earth view of the port with icons of the ships in the area. Click on the icon and it will show a description of the ship and often a photo of it. It comes from a commercial maritime tracking service that you can zoom out from, move to, say, Philadelphia, and zoom in to see what is happening on the Delaware. The data is not live, but refreshes every 90 seconds, which is often enough. It is handy to look for an approaching ship when nothing on camera seems to be happening.
The usual opening view is of the port with docked cruse ships in the background. Hover your cursor on the upper left and an arrow will let you switch to a different view. Hover on the lower left, and you can switch to full-screen. Either camera may be tracking an arriving or departing ship, or just watching some special activity. Once it showed a freighter unloading power boats from its deck into the water.
If, despite all of this nothing still seems to be happening, you can open a port schedule that shows the arrival and departure times for the day and come back later. Smoke coming out of the funnel on a cruse ship usually indicates it will be leaving within a half-hour.
Sometimes I check all of these possibilities, but mostly I just take a quick glance. Since you never know what you may see, it is addicting.