Full or half day excursion on first day?

[NCHPcruiser]

Our first day on our upcoming Med cruise we are in Sicily from 10 am-7 pm. I am debating whether to do a semi-private full day tour (which will include Mt. Etna) or a half-day private which does not include Etna. I'm not sure if we would rather have some time in the afternoon on the ship (perhaps by the pool with a cocktail), relax and decompress from our busy lives at home. Or is Etna not to be missed and will we regret it?

[BSinPNS]

If you are flying in from the states and have just a night (or less) in Rome, you may want to consider how tired you might be. If you have a few days in Rome, you will be ready for a full day's adventure.