There are many nice spots
to camp at "the farm" and everyone is welcome to do so.
Other than that, there are a few hotels in Opelousas that are about 10min south of the farm and are right off of the highway (we have not stayed at any of these so can't really tell you about them):
Holiday Inn- Opelousas:
5696 I-49 North Service Road, Opelousas, LA 70570
Hotel Reservations: 888-465-4329
Front Desk: 337-948-3300
Days Inn - Opelousas:
5761 I-49 South Service Road, Opelousas, LA 70570
Days Inn Opelousas webpage
Bed & Breakfast spots - Washington:
There are quite a few Bed & Breakfast spots right in Washington. Here is the Washington Site for more information on them.