From Chicago (about 1 1/2 hours)
I-94 North to State Road 142 (Mars Cheese Castle Exit)
SR 142 West/Left 10 Miles to County Road B
County B North/Right 1/2 Mile on Left

From Milwaukee (about 45 minutes)
I-94 South/Right to State Road 142
Then as above

From Lake Geneva (about 30 minutes)
State Road 50 East to State Road 75 (light in Paddock Lake)
SR 75 North/Left to SR 142
SR 142 West/Left 3 miles to County Road B
County B North/Right 1/2 Mile on Left
(There are 2 more 'scenic' routes from Lake Geneva - Call the winery and ask for Charles)

From Burlington (about 15 minutes)
Find your way to the east side of the Fox River on SR 11
At the light where there's a Mobil on the corner and a bridge on the right
    you have 2 choices:
    1) Go Straight onto SR 142.  Seven Miles to County B. Left 1/2 Mile.
    2) Turn Left staying on SR 11. Seven Miles to County B. Right 2 1/2 Miles.

From East Troy / Muckwanago / Waterford (about 30 minutes)
State Road 83 South to State Road 20
Follow through Waterford  to SR 36
SR 36 Southwest/Right 1 1/4 miles to County J
County J South/Left 7 Miles to SR 142
SR 142 East/Left to County B
County B North/Left 1/2 Mile

From SW Milwaukee 'Burbs / Franklin
2 Choices
1) US 45 South to 142. Right 7 miles to County B. Right 1/2 mile
2) SR 36 to County J. Then as above

From Madison (a little less than 2 hours)
I-90 SE to US 14 / SR 11 Near Janesville
Follow SR 11 East to Delevan
2 Choices
1) SR 11 to Burlington, then as above
2) SR 50 to Lake Geneva, then as above

From Kenosha (about 30 minutes)
County S / SR 142 West to County B. Right 1/2 Mile
OR
SR 50 West to SR 75 in Paddock Lake.  Right, then as Lake Geneva Directions.

From Racine (about 45 minutes)
County 11 West to County B. Left, then as Lake Geneva above

St. Paul / Minneapolis
(I know you're out there)
About 4 hours to Madison, and then you have a choice:
1) I-94 E to Milwaukee
2) I-90 SE to Chicago via Madison
Directions from both are above.