How to Run a Company Retreat for a Remote Team

What was awesome about the trip? Be as detailed as you'd like. What should we do differently the next time around? Be as detailed as you'd like. In retrospect, did you like the 3 day hackathon structure? What was good? What could be improved? We had a handful of roundtables this retreat. What was good about these? What could be improved? How did your team day go? Any other comments?