you can actually walk to the Paradise Point Tramway from the pier. Its 10 minutes walk tops, The ride up the mountain takes maybe 10-15 minutes, you can spend as much or as little time at the summit as you wish. I would buget at least an hour of time.
i have not riden the skyride yet but i will be doing it in the fall during
my research i found a web site for the skyride so here is the website
stthomasskyride.com there is alot of information on this site i hope this helps you
We did this on our first cruise. It was awesome! The cost is $16 pp, and dont forget to try a "bushwacker" at the bar. They're strong, but really good! Make sure to have a camera because the view (going up and on top) is simply spectacular! There is a few shops on top for a little shopping too. We stayed up there for about an hour or so, and then took a tour of the island.