Blue Lagoon does not provide access to a centrifugal dryer. However, there is a valid reason. Due to the nature of the Blue Lagoon seawater (rich of ingredients such as silica, minerals and algae) the dryer would not work properly. In fact, it would probably ruin your swimsuit as the silica would get stuck in the fabric.
We recommend that you rinse your swimsuit with water (e.g. in the shower area) and then squeeze with your hands to remove the excess water. We do provide little plastic bags next to the towel rack to store wet or damp swimsuits.