Tucquan Glen Nature Preserve

Open daylight. Closed dusk to dawn

No, it's just a hiking trail that leads back to the river. The closest you'll get is some rocks to sit and relax on and some swimming spots.

I don't believe there is any other way but to cross over on down trees.

People who are saying an hour are probably walking at a relatively slower pace. I have timed myself from 35-45 minutes to get to the end on the shortest route. (Crossing at the beginning of the trail and stating on the left the whole time). If you don't stop, you could do it in 30 minutes each way.

Sure. No one has stopped us from going in the creeks so far. If you go far enough down the main trail... almost to the area where the trail opens to the railroad and the Susquehanna, there are some really nice pools in the creek. Creek shoes or "get wet" shoes are recommended with rocks, etc. in the beds. My guess is everything you do is at your own risk. Check and make sure to comply with the preserve rules posted in the main parking area. Have fun. Be safe.

Not sure, but tucguan does

Straight shot down 372 and up River road, about 12 miles

This area is owned and maintained by the Lancaster County Conservancy. Parts of it were closed, but that was years ago. The area should be open to the public for the foreseeable future disregarding any problems with parking or erosion.