Amazon Silverweb, the Marketing Director of Avenue, has built a gorgeous destination called North on the Shadow Falls sim, The effects of plantings and landscaping are some of the best anywhere. Although most of the sim is open for visitation (the interior of the house is amazing), part of it is blocked off for private usage.
Here is the description from the Second Life Destination Guide:
Come explore dense forestry or traipse through sandy beaches. Dream, explore... North.
Highly recommended for a visit: