I've cruised out of San Juan twice now, flying from the UK and spending a night in a hotel before boarding the next day. You're very, very unlikely to arrive early enough to feel like going anywhere other than to bed in San Juan - by the time you get there it's likely to be about 6am UK time. However, the next morning you will probably have time to have a bit of a walk round town. We love San Juan - it's colourful and vibrant. Our cruise last April idn't depart until 11pm, so a lot of people boarded the ship, dumped their things in their cabins and then went ashore again.
It's been a while since we traveller with Delta but they were ok and certainly better than AA. Changing at Atlanta was not a problem and indeed we were bumped up there but I can't remember why. To find out your flight times and the actual aircraft that will probably be used go to www.delta.com and check it out. Once you have done that go to www.seatguru.com and see which seats are best and which should be avoided and some other interesting bits of information.
You can look up your hotel on the net as well and from your flight times you will be able to see what time you arrive and as you will probably leave to join the ship at about 11am you will then have some idea of how much time you have. I would allow some time to recover from Jet lag though. I am not sure where this hotel is but many parts of San Juan are a bit iffy at night so be street wise. I'll leave the rest to someone else....... Neil.
Thanks very much Neil. I will look this information up.