Our favorite close spot from Baltimore area
We've stayed here at least a half-dozen times with a popup. The smaller B loop is nicer, but no electricity. Pets allowed only on a certain portion of the A loop. The bathrooms are clean, the lake is small but pretty, and the hikes around the lake, and up the mountain on the ridge, are as easy or as challenging as you want. Cell service is pretty much nonexistent so you definitely get unplugged.