Where to locate new pond in spring

Hi everyone. We just purchased a new home and I know it's too late to dig
our pond this year, but we're not sure where to put it in the spring. The
back is southern exposure, with a small slope 1/4 way into it and several
trees including one very large Pine.

Here is a pic of the back garden, any ideas on where is best? (The kiddy
stuff is going as our son is 13.) Oh and the big vegetation to the left of
the arbor that goes nowhere is the previous owners veggie garden which we'll
be getting rid of.

http://www.britsintheus.com/backgarden.jpg


Lisa