I have not placed that many caches, but I have chosen spots that I have already visited multiple times before even considering a cache: they are areas of intrest or value, even if only for me. I do not like to see caches placed with the "just because I can" reasoning. very rarely do I see a good randomly placed cache. There are some quick grabs that I have seen placed by some that I have not even considered going out to find; they contain a one-sentence explination of the location and the coords, and maybe the type of container it is in. I do not consider them real "finds"; they are usually outi n the open, poorly hidden, and easily found by muggles and destroyed quickly.
Think "what entertainment will this cache provide?" if the answer is none, or will just help increase someones count, I would suggest not doing it, or at least make it a puzzle or multistage cache.