Arrive and leave on the days and at the times that you initially promised.
Barring anymore airport closing blizzards this time around I plan to leave Ixtapa on the date and at the exact time that my itinerary shows. I also plan to pack closed toe shoes just in case of knee deep drifts upon my return to the states...
Try to fit in with the host's schedule, or let him or her know beforehand what your plans are.
Bring your host a nice gift. (Alternatively, may I add, you can send a gift afterward, once you have seen the house and have gotten a sense of the host's taste.)
If you have special dietary requirements, bring your own food or politely let your host know what they are prior to your visit.
If you are staying for a few days, take your host out for lunch or dinner.
Either share the cost of or pay for events that you (the visitor) suggested.
Hmmm, how to convince my Mom the beach massages are her idea???
Kindness of my Mom and Dad who I'm sure are getting a little weary after three months of a revolving guest door. Don't fret, I'll just be taking my tan quietly and leaving...XXOO