Roast marshmellows over a backyard fireplace (even a barbecue will work).
Fly a kite.
Go star gazing.
Make a list of what you love about each other and exchange lists.
Enjoy a picnic in the park.
Make a time capsule to open together on your anniversary.
Watch the sunrise together.
Listen to music.
Give each other a massage.
Have a snowball fight.
Take a walk in the rain.
Make a video together.
Go camping.
Feed ducks at the park.
Go to a Drive-In movie.
Bake cookies together.
Play frisbee.
Take time to put romance into your relationship while creating memories that build your relationship and let you grow closer.

In addition this site, http://www.sandiego-romantics.com/romantic-dates.html - Top Ten Romantic San Diego Dates has ideas that can be adapted to other places.
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Cheers!