OK, here are some of the places I have been spanked that enjoyed for various reasons, the next part will be places I still would like to be spanked but have not managed it yet:
In a field: good in summer, winter would be more painful (cold is not good!)
In a hot tub: LOVELY! and so warm....but more painful because the bottom is wet, which appeals to my masochistic side (please don't get me into the science of this)
In Chinawhites: Yes, really....caused a few raised eyebrows, but my love of public humiliation allowed me to ignore that.
In a pub: But you know all about that story...again more joyous public humiliation (I will talk about that another time)
over the bonnet of a car: In the dark in the country, so a very erotic episode
In a cinema: Outside the screening room once the film had finished (we did at least let everybody leave, but since we were watching Secretary I doubt anyone would have minded!)
and that is all I can think of so far, but it is late and it has been a long day....if you know of any I have missed, do let me know!