If your looking to find about 6+ caches in teh same relitivly place I would recommend Winton woods, i have 2 caches there, and there are many more in the park too.
http://www.geocaching.com/seek/cache_details.asp?ID=50826
and
http://www.geocaching.com/seek/cache_details.aspx?ID=47548
However even if you go to Winton woods or the garden bug cache you will have to buy a park permit, which are $3 for a year, and $1 for one day pass.