Having cruised quite a few times and having been on Ocean Village twice, i would recommend doing your own thing - just keep an eye on the time. We have done organised excursions and they are very expensive! You can prebook hire cars in most locations and the car will be waiting at the dockside for you. Just a bit of research and some maps and you'll be fine. The cost pp for 2 is a lot less than an organised excursion and you can set your own itinerary - and if there are 4 it'll cost you about £10 each. We always plan to get back to the ship at least 90 minutes before departure in case there is a problem. Be adventurous and do your own thing.
We are going for 2 weeks this month and need to know more about doing the sites on our own. we are doing both temples and tavernas and olives and ouzo we need lots of information. If we get a taxi anywhere how do we get back, are there plenty of taxis? Not keen on a hire car so it would be taxis or bus. Would like to know how far the walks are to the towns are any miles away?
It depends how confident you feel. Ship excursions are normally very good - one big advantage is that the tour guide is responsible for getting you back to the ship on time. If a tour is running late they would hold the ship - they wouldnt normally do this for independent passengers. An advantage to doing things on your own is that you can look at things at your own pace. Sometimes on ship tours you get whisked around too quickly to see what you want to - or the other way, less abled passengers slow everything down. I would recommend looking at the excursions available and compare it to what you could do independently - some ports are easier to get around than others.