I was taught, in my days as a glider pilot, the 'SAW SHOWS' mnemonic.
Size
Animals
Wires
Surface
Height (sufficient to reach the field and execute an approach)
Obstacles (trees, fences, hay bales and the like)
Wind
Slope
One aspect of PFLs which tends not to be emphasized is the likelihood of a forced landing being made from a height less than the standard 2500'.
Transitting a low level route, for example, may only allow time for a straight in approach or, maybe, base and finals.
The gliding technique of flying from field to field may not be looked upon as being necessary in an SEP, but an assessment of the general area towards which you would head is definately required - that should take care of a few of the SAW SHOWS issues without too much additional thought leaving you to concentrate on final field selection and for planning and executing a succesful approach.
FOK