DH and I don't do any weights for a week. We typically do short and sweet cardio each night of the recovery week...4DS is a good plan without the weights. HTH
No weights for me either. I do a lot of yoga, some short, easy cardios (I agree that 4DS is perfect for this) and also take a few days off. I have found that my body is really tired after each mesocycle, and the rest is needed.
I like to use recovery weeks for functional fitness* (which uses light weights), 'prehab'-type workouts, core workouts as well as stretching and very light cardio.
*Something like the FitnessFix workouts ( www.fitnessfix.ca ), for example, or Tracie Long's "TLT" workouts.