Shai Hills has two main climbing spots, Elephant rock and Hioweyo (Talking drums). Both have some 20m climbs and nice shade under trees. The top of Elephant rock can be accessed from the rear to set up ropes. For Hioweyo you must walk up the hill for 20 minutes.
The rangers know the places and both are bolted.
From Accra to Tema. Follow the Akosombo road till you get there.