A couple of easy ones for you.

1. Use a post hole digger and drill your self a hole about 2 feet deep, layer corn and dirt until full. Then throw some corn around the area. Once the pigs find it it may take while to get all the corn.
2. Use a piece of 4inch black flexable PVC pipe with drain holes, like what you use for a french drain line. Use about 10 feet tie one end with a STRONG line up high 6 feet or better and stake the other end. Fill with corn. The pigs will spend a long time tring to get the corn to come out of those little holes. Also make lots on noise while they eat, so you know they are around.

Enjoy.