We did this the NYE cruise (2008) weather was great, warm - about mid 80's
We booked thru
DCL
We left the ship about 9:30 a.m., walked from ship down pier to the ferry - 45 min ferry ride (and it was rough seas), off ferry - all got stopped to have family pictures taken, lined up into our tour groups, 5 minute or so walk to the parking lot (no stopping along the way) where the buses were parked.
About a good hour bus ride, short stop at a roadside store - what I call a tourist trap - you could use the facilities - purchase trinkets - as we boarded the bus we got our lunch - Subway sandwich, chips, muffin and water, and then maybe 30 minutes to the ruins.
Our tour came with wrist bands to ride up to the ruins,
up the stone stairs
through a stone tunnel and the ruins
This is the only ruin that was built by the ocean - they still don't why for sure
Our guide spent sometime telling us about the ruins which was pretty good
You get some time to walk down about 3 flights of stairs to the ocean, walk the ruins some more, there was one little gift shop had some ruin merchandise, bottled water and bottled pop, restrooms, a line of street vendors - very pushy vendors - and at your appointed time, back to the bus for the ride back to ferry. Our ferry ride back was very very rough and I think we were back on board the ship between 4 - 5. After the ferry ride back, we didn't feel that good to explore anymore
The stone steps up to the ruins are rough stone and no handrails - but you could use the wall going up.
For the stairs up and down to the beach - think of 3 flights of wood stairs - they did have hand rails - so many stairs, a platform turn slightly more stairs - another platform etc. I didn't go down the stairs but my daughter did
There was very little shade - at one point I was standing under a little tree for a few minutes
Our bus had a potty at the back and the ferry does have potties also
Hope this helps