Every couple of weeks you see a new video of people in Alaska, Europe, Asia, etc. surfing tidal bores in rivers. Why are there no tidal bores in Florida?

We mostly don't have adequate tide ranges.  The river most likely to have a bore would be the St. Johns, but its flow is so erratic (in spells of dry weather, it flows backwards for long distances) that bores would be rare.  Wikipedia says the Savannah River has a bore.  

We don't have the right combination of conditions to cause that effect. You need narrow river channels combined with strong tides among other factors

Tidal bores:In a few places on Earth, local geography and tidal conditions align to cause a phenomenon called a tidal bore: An incoming high tide collides with the outgoing tide in a narrow channel, generating a turbulent wave front. The shape and size of a bore tide varies greatly, from gentle undulations to a powerful single wave rolling over any obstacle in its path. China's Qiantang River claims the highest bore, up to 9 meters (30 ft) high. In other places, such as Alaska's Turnagain Arm, Brazil's Amazon River, and the River Severn in the UK, surfers paddle out and try to catch the bore tides for a quick trip upstream.

Apparently you've never hung out with the old guys on the boardwalk,

drinking coffee and waiting for the tide to drop...

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Ummmmmm, , , , that's why we called it "The Bored People Walk".

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Ditto! . I have definitely been bored in Melboring Beach many a times.

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Time and tide wait for no one.....