The small, stunningly beautiful lake Kaitalampi is located just 24 km from the Helsinki city centre, off Porintie (120). Plenty of parking space (shared with a golf course, SHG Luukki [http://www.shg.fi/]), is available at N60°19.300 E24°20.258. Marked paths head out from the parking place to swimming platforms and fireplaces at the lake; Ideal places for a picnic/BBQ and taking a dip.
If you'd enjoy a longer hike in the woods and around the lake, start your visit at GCF977 Look at the narrow lake by Jouko. From the starting point you can continue either with your geovehicle of choice to either of the parking places or on foot by good paths to the caches (8 km there and back, plus plenty of opportunities to take a wrong turn on the way).