in reply:
sex on the beach: sounds sexy, also has the potential to be painful
sex in the rain: sounds really fun, like late summer, a warm downpour at dusk, good one.
sex in the snow: there's something about wearing all those snow clothes that makes me want to get naked too.
sex on the hood of a car: best after the car has just been parked, while the hood is still hot
sex on a playground: best place by far is wedged up in the yellow curly slide
sex on a counter top: again heat is a factor here, counters are cold, so try doing it over the dishwasher after a cycle.
sex in the kitchen: surprise kitchen sex is fun so long as boiling water and bread knives aren't in use.
sex in public: midnight on the 50 yard line of my high school football field (2 years after graduating)

some of mine are:
-my fiance and I bring home a strange girl (so cliche)
-sex in a moon bounce when the carnival has closed for the night
-sex on hotel balcony
-wild girl fantasy where my girl gets a bunch of fake tattoos and a wig
-sex while house sitting for someone
-fill up a kiddy pool with lube and just slide around
-get chained to the bed for a weekend as a sex slave
-have sex in the same room as a bunch of hot couples you know from school and work, not an orgy but close.

not too crazy but still enough to keep me busy for a while.