If you want to cruise to be with other singles I suggest you take a look at our singles cruise area and check out the singles cruise group providers. They will match you up with roommates and make sure you have penty of other singles onboard.
My personal opinion is that unless you don't mind being alone that cruising is not for a singles traveling alone (it is great for friends to travel together).
It is just that you are not guaranteed to meet eligible females, if that is what you are thinking, unless you go with a singles group.
The people who like to cruise solo tend to enjoy solitary activiies' reading, movies, etc. For dinner you can dine with other cruisers, but they may not "take" to you.
Anyway - those are my thoughts, as a male. I have done it a few times and generally much prefer to go with company.
CruiseMates: Guide to Singles Cruises
<- link to our singles area.