Old Tunnel is named for the old train tunnel that runs through the front portion of the park. The tracks have all been taken up but the tunnel itself is neat. The real draw to this park is the bat emergence. We did not see them emerge but even peering into the old tunnel during the daylight hours you could see a few bats flying around.
This park is free to get into and there is plenty of parking. The only thing that costs is going down to the lower viewing area to watch the bats in the evening, it costs $5 per person. The park has a donation box also if you are interested in donating.
There is one main hiking trail that goes through this small park with a couple of little loops and it is just about a mile long. The trail is well marked and easy to follow. We hiked it fairly early and were alone except one other family but later in the day it is a popular park.
If you are ever in the area be sure to take a little time and stop by this pretty park. Please remember to take only pictures and leave only foot prints. Happy travels.