The favor often will be returned tenfold. If you have young children and your neighbor does, as well, propose a babysitting co-op, in which you trade babysitting. Be mindful of your noise level. If you own an outdoor pool, avoid late-night revelry. Keep radios inside, and avoid mowing your lawn early in the morning or late at night.
Parking is a particularly hot issue among neighbors.
Allow your guests to park at will in front of your neighbor's house. If you spot another neighbor's dog doing this to your property, you've got to speak up, regardless of how uncomfortable the thought makes you. If you'd rather get a root canal than confront your neighbor, be a little more subtle. He'll get the message. Remember that although you own your home, your block is community property.