From Seeger, the major stream crossing is the Dry Brook which can be impossible at times though as Mark says, probably not now. The crossing is right before the leanto there. Also, the trail between the Flat Iron Brook and the LT can be wet because there is private access by homeowners and hunters back there who drive up the trail, creating $%#% tire ruts which fill up with water and puddle.
You can also do Doubletop and Graham there as a loop, FYI.
I've done the Belleayre/Balsam Loop, you can even do a loop down to Rider Hollow and then up to Balsam though it's a nice elevation drop. I saw a bear once between Balsam/Belleyare and the trail between the two is sometimes overgrown.
As Mark alludes too, the summit of Belleayre is not where the trail from Lost Clove and the Maplecrest trail intersect, but at the furthest most ski lift, which is on Belleayre Ski property. You'll pass the nice Hirschmann's leanto on the way which has good views and no water...
As far as GPS points.. Like Tmax mentioned, Eagle is silly as it's a jump off the trail...
http://www.chayden.net/Catskills/Catskills.html
There are GPS coordinates as measured by some folks from the 3500 club and here.. You'll find Big Indian's there at least.
Jay