Re-paint exterior - actually would be even better if we re-sided with cement siding like we just did the garage, plus we'd never need to re-paint
de-junk - I can't think of a room that wouldn't be improved just by having...less.
And a lot less important;
replace the normal sink with an apron sink. we wanted to do this in our remodel and the cabinet designer talked us out of it. We've regretted it ever since, but we'd also have to re-do the whole thing to accommodate the apron sink. Really pricey - not any added value but we'd be happier, sooo...