I would absolutely take the bet that POTUS say they use vacations to gear down some. Gearing down for them is a lot different than you or I gearing down. For them it could mean have an extra 2-3 hours per day with the family or being slightly less stressed.
I would also believe merely being in the WH is more stressful than being at a ranch or at a beach.
I like that they even made it a lefty club.
I have a much bigger problem with time spent on fundraising than I do with time spent on vacations.