Some good points made here, but one that is often overlooked is that as grass runways are often quite bumpy, make sure you forewarn your pax that your usual smooth landing may be slightly less smooth ...... ask them to imagine driving at 60 mph on a motorway to the same 60 mph on a grass field.
Also, make sure you do have the runway positively identified; unlike a hard runway which usually stands out extremely well, a grass runway can sometimes be difficult to distinguish from adjacent areas like a taxiway, or perhaps a recently cut sileage area. An overhead join first-time at a grass field is a good start, but if in doubt, go around from final and have a good look as you do so.
Hope you have a good trip
Slip