I know it's not Kissimmee but Winter Park, near Downtown Orlando, is well worth a morning or afternoon's visit, with shops/restaurants and art galleries etc.
The majority of us stay in Kissimmee as it offers easy access to everything and a lot of the villa rental homes are located here, whilst it is a pleasant place and a drive down the 192 is okay it is not necessarily somewhere where you would go for the day.
I think me and Tony have suggested 2 good places earlier though, Old Town isn't everybody's cup of tea but at the weekend's we find it a really good evening out...