There were just two more I had, but the post was already a bit long so I said I'd add those later (and nearly forgot). The sixth point, which ties into the anticipation and preparation phases, is to balance the prayer times with outward focuses. Pray for people you know, situations of suffering, people you find relationally difficult, your family, your work, God's kingdom in your town. I have a lot of work to do in this area. I can spend long periods of time in thought and reflective prayer about me and God, but those prayers bring much needed balance. Some folk I guess might need to re-align the other way as they are so altruistic that they can only think of praying for others at the expense of allowing God's Spirit to shed light on their inner difficulties, bringing wholeness and directly glorifying the Father and the Son.
Finally, I knew before I went that I needed to arrange a couple of meet-ups with people whom I could talk to openly about some of the experiences of the retreat. So much happened for me while away, that I knew I would not be able to relate much. But the idea of meeting two friends the very evening I returned and hearing their question "so how'd it go?" meant that I knew I could not simply surf some experiential wave, "er...yeah, it was very peaceful, it was deep, really good, err....". I needed to know some of the real things I could fall back on once the hum-drum of normal life kicked back in, and also continue the journey.
So: prioritise it, good location, anticipate it, prepare practically, enjoy it, strike a balance and ensure a rapid review.
I hope these pointers are helpful in planning your own retreat soon!