Well, here's the effort so far, after probably 10 run throughs, I decided to keep this one. 1st time through is pretty close to the proper melody, then next few times are more improv.

I will give a go on guitar now - that is probably going to be much more of a challenge at least from a fretboard knowledge standpoint.

Here's my right-hand only electric piano improv.
https://soundcloud.com/rockstar_not/500-miles-high-week-3