All Nippon Airways Mileage Club - what could i possibly do with 8400 ANA miles?

I have had these in my account for sometime. I can't transfer them to mileage plus so don't know what else to do. Thanks all.

One possibility is oneway domestic award flight in low season : such as Tokyo - Osaka
which requires 7500 miles. (subj to availability/seasonality)
http://www.ana.co.jp/wws/japan/e/asw_common/amc/reference/tukau/kokunai.html

Else, you can try shopping awards :
http://www.ana.co.jp/wws/japan/e/local/amc/reference/tukau/3000mile.html

Or.... coupon awards :
http://www.ana.co.jp/wws/japan/e/local/amc/reference/tukau/coupon.html

Good luck !