I only spend a Sunday there as I had gone there to dive. The place appeared dead. Restaurant choices were very limited. Early morning I went to McDonalds, opposite the movie theater and asked for an oatmeal. The lady gave me a surprised look. "This is McDonalds. We dont serve oatmeal!" I told her "In Washington DC McDonalds has oatmeal." She just shrugged. Then I went to the movie theater and even though it was a Sunday there were no lines in front of the ticket counter. I was thinking where the hell are all the sunday movie-goers? I asked the girl at the ticket counter if this place was open. She said yes. Then I thought if my wife and I would be sitting and watching a movie all by ourselves since there was no one around. That seemed to be the case so we decided to go elsewhere. But there was no elsewhere to go to. There was a beach so my wife said she would lay on the sand until I did my dive. I had to kill a few hours till the dive and those turned out to be long hours.
Being less crowded is a big part of the reason I like Jupiter. I actually wish I could have lived here 20-30 years ago when it was significantly more sleepy.
There are plenty of restaurants in Jupiter, and even more if you include Juno Beach and PBG. I don't think not having a specialty item at McDonalds is a reason to dislike a town though...most people I know avoid eating there completely anyway.