ok...there are/were a couple of topics on here about sand in runs. I am picking up sand for my run in 2 days and have been reading everything I can to figure out what sand is best. I have read countless arguments for both sands...and just now I read something new that said playground is best b/c it's safe for the birds to eat (why???). My head is spinning. So...please please..help me make the right choice Thank you!!!