Notwithstanding the emotional satisfaction it would give to Trump’s opponents, the man on golf cart is highly unlikely to get jail time, for the following reasons: he has no previous criminal record; he’s old; and the felonies he committed are of a fairly low level. In addition, the Secret Service would have to come with him, which would disrupt the prison routine, and it would play perfectly into his martyr narrative. It’s not going to happen.
So what is a suitable sentence? I think he should be required to put on a jumpsuit and pick up trash in Manhattan once a week for several years. Community service is a concept with which he is unfamiliar; perhaps he should get used to it. It would humiliate him without making him a martyr. He might even lose weight in the process, which would be good for his health.