Sheboygan is a bright, walkable Lake Michigan city with sandy beaches, great wind- and surf conditions, parks and bike trails, a lively downtown with good eats and arts—perfect for multi-week therapy contracts where you want weekend adventure and a friendly community rather than boredom.
For bigger-city variety, Milwaukee and Green Bay are both within about an hour for airports, pro sports, museums and a wider dining/nightlife scene when you want a weekend change of pace.