Glad you are heading back.

If money is not a major concern, I would take one of the ferries across from the airport. GB Express is who we have used. Probably any of the little stores at the airport might have some sunscreen so I would check there first. I have taken both the public ferry and GB Express and if there is any issue with boats I think the GB is the better option.

Looks like GB Express has added some new boats also.

Have fun!