gurlie
I am surprised he is only going once a week. Most people here who attend Celebrate Recovery also go to AA or NA since Celebrate Recovery is only once a week.
In the end, what works most is how well he works his program. This you can't control which leads me to your trip.
Yes you should go to the beach. If he is going to use will find a reason or time. It has nothing to do with you and everything to do with him.