Not do any resistance training for a week and keep on the diet is what I would do. If you've been training diligently for the past 8-12 weeks, a week off will probably do you some good, it will let your whole body recover and get stronger. You should be able to come back to the gym and feel just as strong if not stronger after your 5-7day break. There will be no muscle loss in that small timeframe. In terms of other things, sure I'd stay as active as possible, run, swim do whatever. If you feel you really need some resistance training in there or you've already had a week off recently bodyweight exercises along with some cardio would be great. Do some pushups for high reps, find some logs and toss them around, farmer walk with logs, grab a branch and do some chins.