Charlie had a wonderful solo time on the 6/18 Alaska trip. We didn't even need to adopt him!
Part of it was Carnival placing him at a table with other singles in the dining room, and part of it was his charm and outgoing personality. I think he actually knew everyone on the ship by the time it was over!
He stayed in Alaska for a few days, but I'm sure he'll post when he gets home. Seeing his experience totally eased my mind about cruising solo on Carnival. I can't say about other cruise lines though. We heard from some staff, and some former cruisers, that some other lines are not fun for younger singles.
Carnival Spirit 6/26/02 Alaska, Ecstacy 11/25/02 Mexico, Carnival Spirit 6/18/03 Alaska