I’m using Ruby as my go-to hacking language, for research at my university job and for contracting; I’m mostly curious about non-Rails stuff: interesting architecture choices (new persistence solutions?), alternative Ruby implementations, non-obvious applications, integration with other ecosystems, Ruby counterparts for traditionally non-Ruby solutions (NLTK? NumPy?), etc.
As for organisation, it would be awesome to have some water/coffee on location and directions to the nearest place to grab something to eat.