Here is some accomodation info for ya, i copied i from the aust CIK karting site so it was easy, all would be easy 5-10max mins from JMS and about 25min from Port Gawler
Motel Hoffmann
393 Main North Rd, Enfield 5085 SA
Phone (08) 8262 5115
2 person room from $70.00
Highway One Caravan & Tourist Park
Port Wakefield Rd, Bolivar 5110 SA
Phone (08) 08 8250 3747
2 person room from $75.00
Comfort Inn Manhattan
471 Main North Rd, Enfield 5085 SA
Phone (08) 8262 2748
2 person room from $99.00
Quality Hotel Adelaide Manor
574 Main North Rd, Gepps Cross 5094 SA
Phone (08) 08 8349 4999, toll free 1800 882499
2 person room from $120.00