If you don't mind the adult content, Blue Water Cove is one of those pristine beaches you don't usually find in Second Life. There are no stores around, no advertisement with the exception of a board showing the rental sim Blue Water Estates and social media. The island edges have been meticulously made to actually look like the water's edge, not just ending in sand and then water. You'll find rain, pink flamingos, lapping shores, seagulls and lots of places to photograph. This is a bathing suit/nude beach and yes, there may be a few avatars around doing their thing but all in all it's a great place.
http://maps.secondlife.com/secondlife/Blue Water Cove/65/92/25