Pull the trash can over and dump lingering leftovers, spoiled food, and open bottles of condiments, like grill marinade from last summer. You could remove all the glass shelves and bins and wash them or give them a fast once-over with a wet cloth or sponge. Don't forget fingerprints and splatters on the door front and handle. A fresh box of baking soda absorbs odors, too.
Burned-on blobs welded to the bottom of your oven can give off odors and smoke. If you have time to run a self-cleaning cycle — even a short two-hour one — it's your best bet (and you can go do something else while it works). If not, just focus on the worst stains. Take a metal spatula and gently chip off any loose pieces — with any luck, this alone might do the trick. If not, liberally spritz with full-strength ammonia from a spray bottle. Leave it for at least five minutes, then sprinkle on enough baking soda to completely cover the stain; add just a few drops of white vinegar. Let it bubble for a minute or two, then whisk away the grime with a scrub sponge. Rinse with a clean, wet, regular sponge.
If you plant your flower beds in a dimond pattern rather than straight rows, they'll look fuller faster.