I dream of a solo trip, happy to hear you are doing it!!
My sis wanted a 40th birthday solo trip to Disney but sadly didn't make her 40th birthday 
So I say GO FOR IT and make it amazing
If I were to go, I would make sure I had at least one FULL day per park. I know dhs is debatable as a full day park right now, but I would get at least a
4 day hopper ticket so I could do what I wanted there and then hit up another park like MK to make sure I got to everything I wanted there.