Are you wanting to only be on White Bay for the day, or interested in checking out other parts of the island? Do you want to be there when it's busy, or quiet? If I were in your situation, I'd go to White Bay when I got to JVD, and enjoy it while it's quiet. Around lunchtime, pack up and head to Foxy's Taboo on the east end of the island for lunch. From there you could catch a dinghy ride to B-Line for the afternoon, or go to the Bubbly Pool. Then taxi back to Great Harbor for a walk around, if you have time. From there you can walk back to the ferry dock to head back to STJ. That's about a 3-day itinerary for me when I'm on Jost, but it's doable in one day, too

Felix