Going solo is a lot of fun. It's a different experience from going with others. I'm not saying one is better than the other--each experience is unique. When you travel with others, you get wrapped up with the company you are with, and have a great time. When you go solo, I find that people come up to you, and start up conversations (CMs, in particular). Solo trips can be filled with special moments like that.
Although I've stayed at a number of Disney hotels, I now prefer the Swan for a more reasonable price, and the location is wonderful--just a boat ride to either EPCOT or DHS. Also, I only use Disney transportation, and don't rent a car. (I do take a taxi to and from the airport, but other than that, it's all Disney transportation.)
Regardless of what park you visit, do take advantage of the "single rider" lines on some of the more popular attractions. Those can save you a lot of time. Lastly, one of my favorite tours is the Behind the Seeds tour in The Land Pavilion at EPCOT. It's about an hour tour (under $20) and they take you behind the scenes of the pavilion and their horticultural research. It's really fascinating, and I especially like walking through that massive greenhouse.