Keep in mind that the Maldives has hot, tropical weather. It will get extremely hot, and your skin can burn when spending loads of time at the beach. Get your sun protection in order by packing a wide-brim hat, sunglasses, and good-quality coral-safe sunscreen.
Due to the hot weather, hair can get unruly, so pack enough clips, hair bands, barrettes etc. Spending a lot of time in the ocean and hot sun will dry out your hair and skin, so your go-to toiletries will be important.
Also, pack a big beach bag so you can put all your stuff when heading out to the beach. Don't forget to bring along a little backpack if you intend to go on an outing or a snorkelling trip.
Include a dry laundry bag to separate wet clothes from dry clothes. Also, pack a pouch to place all your electronic equipment like chargers and cables. Many Maldives beach hotels the likes of Velifushi Maldives by Cinnamon, will provide certain items, so it doesn't hurt to check with accommodations as to what items are provided.
Take along that book you wanted to read but just couldn't find the time to do so.
Also, include a reusable bottle to carry liquids along with you where ever you go.