keybored, just some practical information that may help you to understand the situation.
Light aircraft all follow the "circuit", which is sort of a rectangular route with the runway in the center of one of the long sides. As aircraft are (obviously) required to land on the runway, they need to be in the extended centerline of the runway for about half a mile to a mile before landing. There's not much room for variation of the flight path here. The same goes for departure. Once you left the ground you typically don't maneuver (much) until you reach an altitude of 500 feet, so the first half mile or so we tend to stay on the extended centerline.
Picture here:
http://www.jimmystorrier.com/wp-cont...10/circuit.png
But apart from what we call "final approach" (or "final") and "upwind", there actually is a lot of variation possible to the exact layout of the circuit. Technically the circuit can be either side of the runway as well. As part of the airfield design, the owners typically prescribe a circuit that avoids noise-sensitive areas. So villages are typically avoided, but avoiding individual farms is hard as they are just scattered everywhere. Also, sound doesn't just carry straight down but sideways as well. So even if we don't fly directly overhead, we will be generating noise.
Here's a (random) actual circuit diagram, which shows that the owners do try to prevent overflying villages.
http://www.airports-worldwide.com/im...en_germany.gif
Aircraft don't fly these circuits continuously just for the fun of it. Arriving aircraft join the circuit at some prescribed point (so everybody knows where everybody else is coming from) and then land. Departing aircraft also follow the circuit pattern for a while until they depart on course. So both will typically be "in the circuit" for only a few minutes. Flying the circuit continuously is typically only done for initial and recurrent training. Recurrent training usually comes down to two or three times around the circuit and that's it. But in initial training it might take a lot longer to get the hang of it. I must have flown close to a hundred circuits during my training.
The other (unfortunate) thing is that during initial training students typically don't navigate all that well, and may also not manage their aircraft very well. So they might produce more noise than is strictly necessary (for instance by varying the engine power a lot during the final approach, instead of making a smooth, constant-power approach) and they might be flying closer to noise-sensitive areas than strictly necessary.
The good news is that circuit lessons typically take less than an hour, after which the student is truly knackered. It's incredibly hard work, possibly the hardest part of the PPL syllabus. And most students only have one lesson a week. So if the aircraft flies circuits all weekend, there must be something else going on. Perhaps a flight school has just established itself? You would be able to find that on the internet of course.
And even with a busy flight school you can make arrangements. They can vary their circuits based on the time of the day for instance, so that it's not always the same people subjected to the noise. Or limit circuit training to certain times of the day. For instance not when everybody is sitting in the garden for their weekend BBQ, but during the mornings where everybody is clipping their hedges with these electric trimmers anyway.
Anyway, like others said. Find out what's going on first. Maybe the above might help you with that. Then see if you can come to some sort of arrangement.