What is there to do in Cabin John, Maryland (near DC) that is inexpensive or free to do? Non-touristy please:)

Visiting the in-laws from Christmas to New Year's day in Cabin John, Maryland. We have gone into DC so many times and we are looking for some inexpensive or free fun things to do or places to go. We love funky, unusual, artsy places. Any good restaurants or bars would be welocome too!What is there to do in Cabin John, Maryland (near DC) that is inexpensive or free to do? Non-touristy please:)
Cabin John Regional Park

C%26amp;O Canal Trail

Potomac, MD is a few miles away via River Rd.
/ The Old Angler's Inn is a wonderfully relaxing restaurant. You are close to Westfield Mall (aka Mongtomery Mall).



Cabin John Regional Park has Ice Skating, Pick-Up Hockey, and a nice outdoor playground with long slides for the kids, as well as a small running train for them to ride.



Down River Road, families can canoe on the C%26amp;O canal.



Take the Wooton Parkway toward Rt, 28 (toward Darnestown), and check out the Kentlands for evening dining, movies, or shopping. The same for the Rio Complex in Gaithersburg by the lake. Lots of people, and upscale family entertainment.



White Flint (Rockville Pike) has Dave and Busters.What is there to do in Cabin John, Maryland (near DC) that is inexpensive or free to do? Non-touristy please:)
Glen Echo Park is right down the street from Cabin John--- it's an old amusement park that has been renovated and reopened as an arts center. There's artist barns and glassblowing studios plus the beautiful Spanish Ballroom at Glen Echo where you can go swing-dancing most Saturday nights (not expensive either!). For dining and drinks, try the Irish Inn at Glen Echo which is moderately priced, good food and a lively bar crowd especially on the weekends. Old Anglers Inn (as suggested by another poster) is also a nice place to dine although a little on the pricey side for what you get. Or go down MacArthur Blvd just over the DC line (maybe 3 miles) to the Palisades neighborhood where there are a number of great neighborhood restaurants and bars. My favorite there is Starland Cafe.
Sorry I can't help you........BUT........had to let you know I am on the upside of age 50 and never heard of Cabin John til now! Thanks!!