Chris wrote:

I have a small yard and a small garden. The front yard is square; the
back yard is L-shaped and most of the long arm is taken up by a boat
and trailer. I have two raised beds and the rest is lawn.

I hope this is enough description. What would be your preference- an
oscillating sprinkler or an impact sprinkler? I have had very bad luck
with oscillating sprinklers- they seem to break after a couple of
weeks. If you have a good brand to recommend, please include it!

For small to medium areas pop up sprinkler heads work well. They're
typically set at the perimeter and adjusted for so many degrees of arc
and spray distance, so that the spray patterns overlap. One at each
corner of a rectangle and one at the center of each long leg will
typically suffice. They'd have no problem watering the "L" shape you
describe. Impact heads are used for larger areas as they throw water
greater distances. You can learn most of what you need to know he
http://www.rainbird.com/index.htm
With automatic sprinkler systems I strongly suggest hiring a qualified
installation specialist, and buy a maintenence contract, in the end
that will cost you less and you'll have a system that actually works.