The Panda Cam on the National Zoo website is great fun. Sometimes the pandas are just snoozing, sometimes they're playing, sometimes they're chowing down--but they are always cute! You can't believe how much time you'll waste watching them!
Giant Panda Cub in the Smithsonian National Zoo in Washington, DC. Truth be told, the panda is better viewed on the online pandacam, but the park is really nicely laid out and makes for a nice stroll. The gift shops are fabulous and sometimes even have very reasonable prices. It's free! It's great for kids!