Takamatau / Uno

Hello there,

Yes, it is possible to activate the JR Pass at Takamatsu station.

An alternative would be to travel to Uno, use a local line from there to Okayama and exchange the JR Pass there.

Via Takamatsu will take longer but is by far a more scenic route, as you take the train over the Seto-Ohashi bridge, it also costs less as the rail route is covered.

Hope this helps,
Daniel