This is probably the most beautiful place to hike around. You can walk the Vikingsholm Trail downhill to the shore, rent a paddle board or kayak to get to the island (Fannette Island), not in the mood for a hike? just drive and stop at the Emerald Bay lookout and take some amazing pictures!. This is one of the coolest views in Tahoe!!
Take the Heavenly Gondola and see the VERY best view of South Lake Tahoe! You can take it up the mountain and take a chair lift up even higher and hike around. Very mild walking/hiking. You can also get lunch at the mountain restaurant. There are cool family friendly activities and a roller coaster at the top!
If you want great food and views check out Chart House! It is above the Lake so you get great views of Sunset!