Personally I prefer to FIND the larger caches. I've only found a few, but I target the larger caches, especially when I take the kids with me. They love to sift through the swag and find something that suits them. These are more commonly hidden in patches of woods, or near local businesses that allow people to place them on their property.
So like a previous poster mentioned, consider who you want to find the cache (families, individuals, teams, handicapped, etc.) Consider parking available, trail access, seasonal changes etc. Think of some of your favorite finds, and don't be afraid to use other peoples ideas.
I'm thinking of placing my first few caches in a local parks where there is easy access in just about any weather.
Just my opinion...