481-500.

481.  Windows with screens.
482.  Fly swatters.
483.  Functional mini-blinds.
484.  Ceiling fans.
485.  Electricians who install ceiling fans.
486.  Lemonade.
487.  White daisies.
488.  E-mail.
489.  Scrabble.
490.  Tents.
491.  Camp fires.
492.  S'mores.
493.  Care packages.
494.  Purple shirts.
495.  Aprons.
496.  Flip-flops.
497.  Walks around the lake.
498.  Comfortable silence.
499.  Successful naptimes.
500.  Having way more than 500 things to be thankful for.