Levi is good

Are the showers open to everyone officially, or are they technically only for spa patrons? I know some areas are open to all, some aren't...

Could someone please comment on the vehicles that are used by this company in Italy? I want to sign up with them for multiple shore excursions but I'm afraid we will feel cramped for the drives to the various locations, especially Rome from Civitavecchia.

I am not a new traveler in general but I'm VERY new to booking international flights. We're heading to Barcelona to catch a cruise next May, and bizarrely, Delta is about $500 higher than other airlines for this flight. We need it to be Delta as we have leftover credit from a previously cancelled flight. We must be in economy/main, whichever the "lowest" fare is on a particular flight to allow pre-selecting seating. Family of four, all adults. I was just wondering if anyone knew why Delta would be so far out of range price wise, especially this far ahead. One of the reasons I selected them for the first flight I booked (for a cancelled trip, which is why we have leftover credit) was the price/flexibility combination. Thank you.