By far the most popular of all the many beaches of Rarotonga is this beautiful lagoon.
Muri Beach is situated on the south-eastern coast of the island, sweeping in a small arch for about one kilometre and is backed by palm and ironwood trees. Perfect for many aquatic activities, it also faces four uninhabited islands within the reef and has a lovely shallow lagoon for swimming (it's possible to wade across to two of these islands).
Muri Lagoon is the centre of water activities on the island and is the chosen spot for those who wish to take their families to a place which is safe for swimming. You can rent paddle boats and catamarans or take wind surfing lessons or even go para-surfing.
Muri Beach is one of the most favoured beaches along this stretch of coast simply because of its glorious sand. The shallow depth makes it a great beach for families, and in some areas you are able to literally paddle out to islets like Kokomiri at low tide.
The lagoon, no matter where you are, is perfect for snorkelling, even if you have never done this before. There are a number of places which have a raui in place, that is, the area is a protected marine reserve, so it means fish are plentiful and easily found in the areas where reef rocks are close by. If you want to spear fish, you may be better heading out to one of the outer islands such as Aitutaki.
There are also a number of restaurants, clubs and bars overlooking the beach where you can relax and enjoy the scenery.