There are some FABULOUS suggestions here, ladies! I'm going to add a few to my repetoire, but here are some of my own:
Take a "listening" walk. Talk about every sound you here. What is it? Where is it coming from? How does it make you feel?
Put on a CD and DANCE. Ask your DD to make up a dance and then you copy it. Switch. Or do the Hokey Pokey! Dan Zanes and Friends and Ralph Covert (Ralph's World) are huge hits in our house, as is anything by the Beatles.
Give your DD little chores. My DS, 26 mos., is great at putting things away, putting trash in the garbage, wiping the table, etc. He loves to "help" and it makes him feel good. You could give her a spray bottle filled with water and a soft cloth and she could help you "clean." Also, watering the plants can be really good.
Find out if your local library has a story time for toddlers. Most do.
If you can, look into Kindermusik or another kid's music program. Theyr'e usually focused on movement, rhythm, and sounds and can be great for toddlers.
Start some hands-on art projects: finger-painting, all kinds of painting with odd things (marbles rolled across the paper, leaves dipped in paint, a flyswatter, whatever strikes your fancy!), gluing (macaroni picture frames come to mind), chalk on the sidewalk, water and paintbrushes on the driveway.
FINALLY, check the sticky at the top of the toddler forum, as well as the toddler archives stickies, for a whole ton of activity ideas.
ex-Californian, making my way on the East Coast with DS (10), DS (6) and WAHDH. Former extended BF'er, co-sleeper, and baby-wearer. Remembering how to garden.