This is a pretty easy-to-get-to cache in a lake park with an earthen dam. You'll park in an unpaved lot at the park entrance; the gate to the entrance is always closed - simply step over it (it's perfectly kosher to do this). Rough parking coordinates are N38° 44.219' W077° 15.145'. I'm having some problem with the mapping of this (says I'm parking you in waters off either Spain or Serbia), but I have checked and rechecked and I don't think those coordinates will lead you astray.
The cache is kid-oriented. The cache locale is suitable for children as young as two years old (and probably any child who can walk). Depending on the age and skittishness of your kids, you will probably have to carry them across the stream or else take someone along to help you with younger kids.
The distance is less than a mile one way and the trail is quite easy (the more challenging part is in the woods, but even for someone as un-nimble as poppy is, it's not a problem), though you'll probably want to avoid having your child in sandals - poppy's son invariably gets five thousand rocks in his sandals when the trail is rocky as opposed to asphalt. Do bring insect repellent, especially for the kids - woods ring the entire park area and you will be going into the woods toward the end. The area is dog-friendly, even for small dogs. The cache itself is buried under leaf litter beneath a log, stashed away in a square Rubbermaid container.
Most of the trail is paved, but there is a section where you have to cross a tiny brook after going into the woods. On the way in to the cache, stop and take some time to admire the lake, and look out for some nice little pieces of rose quartz on one part of the trail. Depending on when you go and how much exploring you do, you may run into geese or deer.
We used brokenwing's Geocache Rating System to rate this cache. I'd have rated it a two on terrain; it scored 2.75, but I'm bumping it down to 2.5, and that high only because the last little part of the hunt is over a stream and through woods, and might pose some minor challenge to an adult with small children. Most adults on their own should have no problem at all with any of the terrain. Should mention that the trees are pretty thick on the last bit of the hunt. I lost a signal a couple of times but was then able to pick up a few satellites with no problems to get good coordinates for eight different readings. I don't think you'll have a consistent problem with tree cover, even using a yellow eTrex (what I use).
7/19/01 - I just doublechecked the cache (had forgotten to put something in) and realized how very many spiderwebs there are on the last bit of the hunt. Pick up one of the many sticks on the ground and wave it in front of you as you go (or else have a tall friend walk in front of you) unless you want to wear a spiderweb hat. Ick! Also, a nest of granddaddy longlegs seems to inhabit the leaf litter hiding the cache. They're harmless, but can be startling. You may want to use your anti-spider stick to move the leaves around once you've homed in on the cache. I didn't run into poison ivy or other plant baddies where I was, but there is some around, so keep an eye out.