Are your activities good for kids and adults? September 18, 2024 21:11 Updated Keystone offers activities for all ages. Information about our summer activities can be found here. Related articles How fast do the tubes go down the hill? Is there a height or age requirement or limit to your activities? What dates will the gondola be open for scenic rides at my local resort? What type of bike can I use on your bike trails? When can I use my lift ticket?