BEST advise has already been given,take a refresher course.I just started diving again after a LONG surface interval & the first thing I did was take a refresher course.Cost me $100.00 for a private,1 on 1 with an instructor,3 hours classroom & 2 hours in the pool,money well spent!If you can't do that & since it's only been a few months since your cert.use the most important tool at your disposal,your BRAIN.Sit down with your wife & discuss EVERYTHING you can remember about the class work & more importantly,the actual dives you completed.Talk about gearing up procedure,any problems or apprehensions you or she might have had before & during the dives.Go over & be sure of hand signals,buddy breathing,EVERYTHING!Practice pre-dive procedures(several times) even if you don't have any gear to actually put on.Are you going to rent gear,if you are you NEED to familiarize yourself with it BEFORE the actual dive trip.Will either of you be changing anything(gear wise)from what you used in your previous dives that might affect weighting?Do you remember how to perform a weighting/buoyancy check?
Just as importantly,get a good nights sleep the night before the dive,FOCUS & DON'T be afraid to abort your dives if either of you is unsure of conditions or skill level.Best of luck & have a great trip!