I called Norwegian Cruise Lines (NCL) today and spoke with a sales rep. She told me that there is no such thing as a 'singles cruise'. She suggested that I contact a company called Sixthman that apparently does some hosting of events on NCL cruises or something of that nature. She was quite adamant about there being no 'singles cruises' although she went on to say that some ships have more 'single' staterooms (for one person only) that others. Thus, you could probably expect that there are more solo travellers on those ships.
I am still trying to find a cruise that would be fun as a newly single guy and would also work within my time frame in July. Can anyone suggest anything??? Primarily the ones I've seen that might work from a time-frame perspective are Caribbean cruises from Florida (mainly Miami) or Alaskan cruises from Seattle or Vancouver. There are other options but those look to be good ones. That said, not sure if they will be full of families with kids and couples...