It has been two days since this question was asked and nobody has come here to answer it. I can only surmise that everybody in Jacksonville is over at the festivals for the July 4th celebrations. You could just head over, but if you are determined to wait and you have a partner that you are quite fond of and a spare room, you could while away a morning or an afternoon together. Afterwards, maybe a lunch or dinner in the hotel restaurant or my favourite, ask the desk for a taxi, then ask the taxi driver for a restaurant suggestion, get the special and the waiters suggestion of wine to accompany.
Afterwards maybe head over to Fort Caroline and see where Jacksonville started over 450 years ago. Maybe some shopping and back to the hotel to browse the internet and see if any one has some suggestions for what to do.
Of course you could just join all the locals for a week of Festivals, Harley Davidson ride, Family Painting, Patriotic Concert, Fireworks, Patriotic Barbecue, Independence Day Parade, Beach clean up and Dance Contest.