Not sure if any of your peeps are newbies, if so, I second the suggestion of the trip to the Bubbly Pool on JVD. Even in May when it may not be so "bubbly" it's a nice little walk and a unique place. Depending on the activity desires of your group, you may really need two days on Jost. I believe the ATV stays more in the White Bay area, but I've never done it so someone may speak up.