Not sure what makes a good FB trail (no sand or snow around here), but for a couple hours I'd maybe try Soaring Eagle. Not too hilly, should have some muckyness, and close to home. Or duthie and get lots of stares. You want hills and muck, go to Taylor and get stink eye from the pony riders.
Carey creek trail is mostly sand if that is what you are looking for. The trail to Bundy pond is always sloppy and works good with FB. A shorter way is to park at Tiger summit and come in from that side if your short on time.
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