Here's some more good ideas of books about business and investing if your investment club would like something to read and discuss over the summer:

The Essential Wall Street Summer Reading List

The list is put together by Andrew Sorkin whose own book "Too Big To Fail" is a good one to have on your list.

Make sure to read the comments to the article also. There are more good ideas in them.

Now all you need to do is find a good beach, a deck or a boat!