The easiest approach is by charter taxi from Busua, Butre, Dixcove, or Agona Nkwanta. Public transport can get you part of the way, but the last stretch is slow and irregular, so day-trippers should negotiate waiting time before leaving.
Road conditions change after rain. If you are staying on the coast, ask locally before setting off; a trip that looks short on a map can take much longer than expected.