It is always best to hunt where you have been seeing them...although 2 or 3 week old spottings may not mean much. Generally, fields are a good choice this late in the season, as the woods normally have greened up quite a bit and can be a little thick to see through, etc. However, with our late spring, I would think that the woods should still be good too. Although many birds have been shot at this point in the season, the ones that remain can now be killable for the first time in weeks...as the hens should be going to nest and a gobbler that normally has multiple hens in tow could now be a bachelor...if not at dawn, then a little later in the morning.
A single gobbler who is still in the mood is what you want!

Mid morning, 10:00A or so, can be very good at this time of the year, so be patient. Use of decoys can be hit or miss in the late season, I tend not to use them this late, or if I do, I just use a single hen. But results, and opinions, on this vary, so be advised. Good luck.