I'm never disappointed by this hike! I've hiked this trail at least 5 time a year for the past 15 years and there's always something new to see. It's my favorite day hike in the DC area. It gets very, very crowded on a nice weekend day. It's best to go on a less than perfect weekday early in the morning or later in the day. If you are going to visit more that 4 times a year, it pays to get the annual Great Falls pass which costs $20 and is good for both the Maryland side and the Virginia side. You can also park for free across from the Old Angler's Inn if there's space.
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