Sleepy Hollow

iliketexmex, the trails won't dry out until June-ish. Once they are dry, it's not a bad trail. It's fairly open and not too technical so one can bang out a some miles if that's what they're after. There are some fun sections for those that enjoy boots off of roots to get some air and there are a few fun flowy sections. They have group rides on Wednesdays once the trail is dry enough.
Of the 13ish mile loop, there is less than a mile that is shared with horses and that part (the island) is easily avoidable.

Fun trail with mixed single and two track trails. Easy to moderate skill level depending on conditions! Easily add or subtract miles by choosing various routes around the park! Beautiful scenery and well maintained! Love it!

It is great to bring the kids or someone new to biking, if you are anything other than a beginner you will get bored really fast. But if you happen to be camping here with the kids it's a perfect family trail.

Very nice trail well maintained. Lots of roots but very little climbing. Gets better every year.

Not a legit MTB trail but a fun place for kids/beginners

Sleepy Hollow State Park has roughly 12 miles of trails. There is a well signed mountain biking and hiking specific loop trail you can ride, with horse trails intersecting it. Fairly easy Singletrack that can be muddy quite often as it meanders through wetland areas. Some quick climbs and a few downhills but nothing exhilarating. Good entry level singletrack. Wouldn't drive more than 30 mins to ride it.

This a pretty simple trail, great for beginners. Hardly any steep climbs, and it is generally pretty open. The east side of the park has section of forest that you can get moving pretty fast through. On the north and east sides, it is pretty easy to get off onto a horse trail, but they're not too bad to ride here, either.