Plan around the actual visit
Diros fits a Mani journey; Kastania belongs with Neapoli and the Vatika coast. Kapsia is convenient to the Arcadian plateau, while the Cave of the Lakes fits a Kalavryta stay. Opening, tour length, boat operation where relevant and photography rules can change.
Ask specific access questions
Check steps, narrow passages, surfaces, boarding arrangements and any restrictions affecting your group. A cool interior does not guarantee an easy visit. Book a required slot before committing to a long transfer, and keep another local activity available if the tour is suspended.
Use managed visitor routes
Tourist caves are distinct from unstaffed cavities marked on a map. The regional tourism authority identifies Nestor’s Cave as closed to visitors. Respect the current on-site restrictions.