Lots of lightweight activewear for the fitness classes, trainers (two pairs better), light flip flops / thongs, and a sarong. A lightweight backpack for carrying water bottles during the hikes and your own refillable water bottle is recommended.
For downtime: light clothing for dining, exploring and relaxing, toiletries, swimwear (for the pool and beach), sunglasses, plasters (just in case!), and whatever you like to read (we also have a full library!).