I went solo and LOVED IT! I had never been to IOA, but had been to USO. I had 3 days to myself. I was absolutely blown away at how much fun I actually had. I met so many people who just wanted to talk, I loved using single rider lines, plus I stayed on site for one of those days and loved FOTL too. I went to a place to eat in the Lost Continent that was close to Poseidon's Fury. It was happy hour and I sat at the bar. The bartender didn't really have much to do so he just sat and talked to me. I had many people offer to take my photo for me. I never felt out of place. I did have one guy on the Mummy comment that he was "sorry" for me being by myself. I told him "on the contrary - I'm having the time of my life!" I also found the characters (Shrek, Spiderman, Wolverine, etc.) paid more attention to me when I went to the front of the line - In fact, Spiderman wouldn't let me go. He said I had to stand there until I got the perfect picture with him, and there was a line!
I did miss not going through the regular queue, as I did miss some of the flare of the rides, but honestly, I rode the Hulk 3 times in a row, and some people hadn't even riden on it yet.
Be forewarned - don't wear white if you plan on going on the wet rides - it took me a while to dry off, and you could SEE EVERYTHING underneath.
I also found that Citiwalk was safe at night. I had a really good time there as well.
I loved the restaurants and ALWAYS getting a table when I walked in. If I couldn't get a table, there was always room at the bar - and where there is a bar, there is a bartender who talks to you. Or, if you pull out a book, or a notebook, they also respect that too. I also found people (restaurant servers, store clerks, ride attendants) were always more pleasant and talkative.
I never felt lonely, and had the time of my life. I could do what I wanted to do, when I wanted to do it. I didn't care how much I spent ever. I could stop for a beer whenever I wanted. I sat at gazed across the lagoon for 15 minutes one day, and I had no one to answer too. I got to ride whatever whenever, I got GREAT seats to shows because there is always space for one somewhere near the front. For one show (cannot remember the name), I actually was the only person with FOTL, and the staff member let me in and made the others wait. While I was waiting inside, all the actors came out and were talking to me and made me feel very welcome. They told where to sit to get the best view. It was wonderful. I had such a great time. I cannot wait to go back again.
Hope I helped - Jo