Trail was great! There wasn't a whole lot of foliage, but everything was starting to bud/grow (Including some ground flowers as well). I saw plenty of chipmunks and squirrels, and snagged a couple shots of some hawks. The second day I went (Went back with my wife), we saw a small garter snake. By the lake there are tons of turtles, and a small waterfall to stop by (I didn't check it out on this trip, but I will the next). Birds are plenty colorful, but equally as hard to capture on film.
It was great weather, but actually did manage to get a little warm towards the afternoon. I trail hopped for a while, and ended up going about 6 miles altogether, but plan on going back to cover more area that I didn't get to see the first time around. I would recommend staying to the left of the park (Not near the horse stables, unless you want to see that stuff). The trails near the horse stables are bridle trails and can be confirmed by all the droppings along the way. (I like to avoid that if possible). You can print out a greatly detailed map of the park if you visit Union County's Park and Recreation Site, which shows the foot paths (Unblazed), bridle trails, blazed trails, etc.