A green tip, taught to me by my friend Krin (thanks!):
Hate to find out that the plastic cups, plates, forks, etc you bought aren't recyclable?
Check for the recycle symbol on the product in the store before you buy. Compare products to find one that's not just a good price, but also can be recycled locally.
Although this seems obvious, I'd never thought of this before until I learned it from her.