Thanks for the suggestions and advice everyone!

We will be ferrying to RT and doing a sleep aboard the day we arrive and only one couple (arriving later) will be staying at Emerald overnight, meeting us in RT the next morning.

I'm unsure what the cost of a chartered flight from STT to EIS would be but my guess is that it, as well as a private water taxi, is out of the budget (we have varying degrees of income so I have to keep everyone's allowances in mind).

I have also looked into chartering out of STT as that would be something new after 7 charters out of Tortola! But, I am pretty loyal to BVIYC and I don't mind dealing with customs to head to USVI for 3-5 days during longer trips than this one (only have 8 night this time! and the newbies want to see the usual sights)

Again, thanks for the seasoned and helpful advice! Looking forward to another beautiful trip