Fantastic!!! Always make sure it is easy for him to hop off your hand again so that he is in complete control. It will give him confidence to hop back on in the future. Sounds like you are making tremendous progress!!
Yesterday was the second time I've been and it's certainly not the safest place to be in the current climate. Even though it's an outdoor area the ringnecks tend to always be in one place, and that area is swarming with people trying to feed them. I don't think I'll be going anytime soon again!