Come visit Cromwell Valley Park, a unique park owned by Baltimore County. The park naturalists are very friendly to geocaching. They have geocaching-centered events along with a ton of other informative, educational, and fun programs. One unique feature of the park is its placement in the midst of the Atlantic flyway. That means that there are multitudes of birds that flock here or fly through here as part of their migration. They also have a very nice nature center to visit where you can borrow a handheld GPS receiver.
So, come on down and enjoy Cromwell Valley Park and say hi to the rangers and let them know you are here to geocache. They may even help you find some caches that you are having trouble with!