I tend to agree with IO540, in that suitable fields are probably very close. This stems from my old habit of looking for a field in the distance, aiming for it, then choosing another, going for that, then deciding the original was the best, by which time I am out of height.
I was subsequently taught by an instructor on a syndicate check out to pick a close field, preferably a little ahead and to the left (and stick to it), head towards it choosing an aiming point 1/3 the way in, and fly an oval pattern about this field, adjusting as nescessary (from the aspect.....picking a point on the left window). When "downwind" select the start of the field as the aiming point and fly a relatively normal pattern, adjusting as nescessary, bearing in mind that final should be into wind (hence steeper glide path) and leaving flaps until late, if at all....If I am too high, I can widen the circuit, and if too low, tighten it in.
EA