The one thing I would add is to watch speed limits carefully. I've noticed that some county roads that would generally be 55mph in neighboring states (I grew up in MN and live in IL) are 45mph at least some places in WI. Going to Delavan via Lake Geneva I'm presuming you'll be on I-94 and WI-50, so you shouldn't have have that problem. IIRC, 50 is generally 55mph outside of towns.