Not sure about the laundry. Life jackets are available at the marina for no charge. You show them your resort card and they let you check it out for your entire stay and you just return it before you leave. The hours are only something like 10-5 though to check one out or return one.
Not sure about floaties. My mom and sister drove down and I had them bring pool noodles with them and then we just passed them on to another family before we left. You could bring your own inflatable water wings or beach balls or something to use if you want. We've only ever used small floaties in the quiet pool. Not sure if you can use things like beach balls or noodles in the volcano pool...