I would be going for a long walk, preferably with some uphill in there! My waters broke before I went into labour (well before I could actually feel the contractions!) , I was admitted to the maternity ward and the midwife told me to go for a walk to help speed up the process so we walked around the hospital block twice. By the time we got back I was getting a gush of water every step (so not a nice feeling!) and not long after I could feel the contractions.

If you're already that far dilated it sounds like you aren't too far off!