We were a group of 5 and we spent 5 days for trekking Poon Hill from 1st to 5th of Jan, 2015.
The Total Expense
Each of us spent $20.42 per day. Or $102.1 for the total trip per person from Pokhara (Nepal).
Riding a bike is a fun thing to do in Pokhara. The rental fee is only Rs.200 a day (for a basic mountain bike). While paragliding is a really popular thing to do (around $110 per flight, I think), riding a bike is a much more affordable activity.