What to do in the Denver / Boulder area

My parents are coming from Romania on May 15th. They're visiting me for a week and then go to my brother's graduation in Baltimore. I am trying to put together a list of things that would keep them entertained. I hope to update the list as soon as I come up with more ideas.

Boulder

• sip some tasty tea at the Boulder Dushanbe Teahouse
  
• hit the Boulder Farmer's Market on Saturday
  
• drive to Estes Park, and do a little hike: Gem Lake Trail, or Bear Lake or Mary's lake, if we want something super easy.
• come back from Estes via Highway 7 and stop in Nederland for a bite
• go back to Boulder via Boulder Canyon and stop at Boulder falls or continue to I70
• visit the Celestial Seasonings factory
• bike along the many beautiful bike paths available in Boulder
• walk, eat, shop on Pearl Street
• go to Skinny Jay's on Friday night for some truly American food and music
• watch me (or others, if my leg doesn't feel better) play frisbee on Sunday
• have breakfast at the Village for some authentic morning grease
• Southern Sun for some hippie infusion
• do a short hike on Mount Sanitas for an aerial view of Boulder
  

Denver/out of Boulder

• walk around 16th street Mall
• go the Denver Art Museum, acclaimed mainly for its green architecture
• eat at Sushi Den, the best sushi ever
• drive up Pike's peak or take the cog train
  
• go to a Rockies baseball game