I think SL is a great place to have fun, shop, dance, etc. but there are some really cool educational or historical type places to go also. One of the places you should check out is the re-creation of the 1851 Great Exhibition http://slurl.com/secondlife/Sterling%20Grove/103/128/22.
Check out the Prim Pefect blog for more information about the Great Exhibition. http://primperfectblog.wordpress.com/2008/05/31/the-great-exhibition-comes-to-second-life/