Mirissa is indeed a paradise for those who love water adventures. If you are someone who loves surfing, go there and practice catching the Mirissa waves like a pro, and you have everything that you may need there (including the instructors and surfboards). These waves are ideal even for the beginners, so surfing with confidence is easy here in Mirissa. Snorkelling is another water adventure that you can try here, and again, if you do not have the equipment with you (and if they are not provided by your resort too), you may get them from a place where they rent them out.