The Unity Webplayer lets you visit interactive and immersive lands with your browser!
Take a walk in a tropical paradise!
First: get the Unity Web Player here http://unity3d.com/webplayer/ (for Windows XP / Mac 10.3 or later)
Then Visit "Tropical Paradise" here: http://unity3d.com/gallery/live-demos/players/island.unity3d
Up arrow moves you forward and you steer with your mouse.
Find the dug out canoe on the beach across the bridge: there is a large bird wandering around there.

On the other side of the bridge - the side you started on - you can climb over the mountain to find a ruined temple on the beach there. The view from the top of the mountain is nice too. Then there is a path over another mountain on the other side!
On the whole: very relaxing.Unity Web Player
The following downloads are available:
* Download for Windows (Internet Explorer, Firefox, Safari, Chrome, Opera, Mozilla, Netscape)
* Download for Mac OS X Universal Binary (Safari, Firefox, Mozilla, Netscape, Camino)
* Download for Mac OS X, only PowerPC (Safari, Firefox, Mozilla, Netscape, Camino)
* Download for Mac OS X, only Intel (Safari, Firefox, Mozilla, Netscape, Camino)
The Unity Web Player enables you to view blazing 3D content created with Unity directly in your browser, and autoupdates as necessary.
Unity allows you to build rich 3D games with animated characters, sizzling graphics, immersive physics. Then you can deliver the games to the web or as standalone players.
Requirements
* On Windows, the Unity Web Player requires Windows 2000/XP/Vista/7.
* On Mac OS X, the Unity Web Player requires Mac OS X 10.3.9 or newer.
http://unity3d.com/webplayer/