There are a great number of clean and safe parks in the area. Also, this is one place in California where you wont smell pollution. Nice simple walks down the street are great, and many things are within walking distance.
Shoreline is Mountain View's gift to the locals. So much there to do, it is a place I visit about once a week. Start with the ampitheather-- it is a beautiful, partially outdoor facility that hosts world-class entertainers. Our mild weather means that this indoor/outdoor auditorium is comfortable all year long. With ample parking and a variety of seats to purchase, it is a great addition to a great place to live.
But even better than the man-made addtion, is the Shoreline bay walk and play area. Go down to the shore and you can rent a variety of floating vessels in which to putter around in the bay. Lots of grassy knolls and room to run for the little, or big, kidlets. Add a golf course and a historical home used as a party rental facility, and you have a park with enough surprises and activities to appeal to most everyone.
Still, the best part are the trails. One can walk, bike or skate for miles around-- wander through protected areas where dogs and bikes are not allowed, or walk along the shore dodging skaters. There is a special area where you can take your pooch on a leash, as well. With several access points along this vast trail, you will see several different landscapes, and a wide variety of hikers. Its a great place to be alone, yet safely visable enough for a single hiker to fee secure.
This isn't in Mountain View, but a short 15 minute drive away. One of the most beautiful nature areas I've ever seen. Very popular and crowded with families on the weekends, mostly because they've got a small farm with animals. Even with all the people, it's still a wonderful spot. To get away from the crowds, head up the mountain for a hike or run. My husband did a lot of trail running during the two years that we lived here. He spotted tons of wildlife - wild turkeys, quails, and even a bobcat once. If you love nature - this is some of the best that the Peninsula has to offer. One warning - there are several parking lots, but it can get very crowded so be patient!
check out this flat panel display. It was one of the first all-digital display on the market. The resolution is 1600x1024.