All the rooms are suites, there are three pools (one inside, two outside) and we love it here.  We have been coming to the Osthoff since our son was born (and before) and have almost never had a bad visit.  The staff is extra nice and there are great activities for the kiddies (fishing, crafts, cooking, etc.).
The Osthoff has it's own "private" section of the beach on Elkhart Lake which is a pretty nice lake, the Osthoff has a number of water-craft, we usually go for the paddle boat (the bicycle-pedal style), maybe this year my boy will be tall enough to pedal while I lean back and relax.

 

Check their website for "Weekend Pleasures" or "Summer Pleasures" packages and book early for hot summer weekends.

 

http://www.oakparkdad.com