Meyer:

It just so happens that my daughter cleans a rental house located on Lake Macatawa here in Holland. I would have to ask her how many it will accomodate, but I think 13 is not a problem. Lake Mac is NOT known for crappie, but holds walleye and many other fish. The lake is also connected to Lake Michigan via a channel. There are a number of good crappie lakes within 30-40 mins. of Holland also.

Do a Google maps, or Bing maps search of Holland, MI and you can get an idea of the size/layout of the lake. Certainly not your only option, but one nonetheless. Let me know if you want me to get you more info.