Catrin,

The Harmony Hundred is a great weekend ride in Indiana. It's in New Harmony and is 50 miles each day. The food is great, it's well organized and takes you through some really pretty country. I've done it twice and would definitely go again. http://www.harmoniehundred.net/

You might also check out Brown County, Indiana, as well. I believe there are 3 different rides in that area referred to as TRIRI (Touring Ride in Rural Indiana). http://www.triri.org/

And then for later in the year, there's always the Hilly Hundred! http://www.hillyhundred.org/

There's a lot of pretty country in Indiana and a lot of good cycling!