I live in Albany, just North-West of Berkeley, near the University Village where Berkeley houses their student families. Albany has a small hill near the shore. On the north side of this hill is a creak that marks the line between the border between Albany and El Cerrito. This creak is also the line between Alameda County and Contra Costa County.
On this hill in Albany is a park aptly named, Albany Hill Park. In this park is the most fantastic rope swing. The rope is tied to a Eucaliptus tree and the length of the rope is easily 30 feet. At the bottom of the rope is a plank with a hole in the middle through which the rope was pulled and then tied underneath. I caution that the rope seems to have once broken and the fate of the swing rider at the time of breakage is unknown (to me). The rope swing is a must try-a true bonding experience to share with a loved one.