5 days in Uttarakhand - late oct

Hi

Me and my wife are travelling in india in late october - early november and our timetable has left us with 5 days in Uttarakhand: We leave Delhi on the evening of oct 25th and have to be back in delhi by oct 31st or by the very latest the morning of nov 1.

We would really like to spend these days trekking or hiking. From my earlier replies here, I gather that we do not have enough time to do the Har Ki Doon trek. Are there any similar treks that are more accessible?

Otherwise, we could go on a shorter trek (two days) and see other worthwhile sights. I would be very grateful for any suggestions on how to best spend these days in Uttarakhand. Thank you.