we are a group of 4 on a cruise ship visiting Katakolon on Oct 01. We want to tour Olympia. Understand that we have several options for transport: private bus, taxi or car rental seem the best. Question is whether we need a tour guide to really appreciate the Olympia sites. And if so what is the best way of arranging one --either ahead of time, after docking or at the site. And what can we expect to pay for one? We'd rather stay away from a 50 person group but don't mind a 12 or less group.