Not much to choose from in that area, the best by far being Prophetstown State Park.
http://www.in.gov/dnr/parklake/2971.htm They have some full hook up sites and are very close to W. Laf.
Caboose Lake Campground is nice as well but is a little further out, maybe 20 miles North on I-65.
http://www.cabooselake.com/ they are also a Passport America Park if you are a member.
Phil