Yes u can
I have seen a few people on bikes but part of the trail will be challenging. Depending on you skill, of course.
It is a hiking trail, I would not recommend. Narrow with lots of walkers, roots and dips.
I wouldn't either
I wouldn't. It's a very rough trail with a lot of roots jutting up into the path, very narrow parts were you're in a uneven strip between two bodies of water, and there are a lot of sheer dropoffs into said water on the St John's River side of the trail. You'll virtually end up walking your bike along the river side of the loop.
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