Not sure there is a "best." But you can certainly do it in Denali NP and in Seward at Kenai Fjords NP. Are you planning on a Kenai Fjords boat tour?
JR. RANGER programs/activities:
Wrangell-St. Elias NP: http://www.nps.gov/wrst/forkids/index.htm
More info incl. SE Alaska: nps.gov/klgo/forkids/upload/aarworksheet.pdf
I don’t know if all the above links are still current.
fti--Yes we are going on the Kenai Fjords tour with Major Marines! Thank you for letting me know about the JRanger activity in Kenai Fjords/
Manitoba--Thank you for the links
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