Places to visit in Jan for pregnant woman

I am planning a trip to Japan for a week and can only travel in end Jan 2015 with my husband. I will be around 5.5mths pregnant by then.
I love nature and scenery and japanese food. Before I got pregnant, I was active and enjoy outdoor activities.
Can someone recommend me places to visit? I went to hokkaido in May and enjoyed my trip. Looking to visit new places.

By the way, if you visit Tokyo,
Suiten-gu is a very famous shrine to pray for easy childbirth.
https://goo.gl/maps/J4ezn
Many pregnant women visit there and buy a maternity belt especially on the day named the dog day by Chinese calendar, because it was popularly believed that dogs have an easy delivery.
http://www.suitengu.or.jp/obi/obi_print.pdf
Jan 21th, 2015 is that day.

Thanks for the suggestion :)

Kyoto would be lovely while you're pregnant! Lots of temples and walking trails to go on while going at your own pace! You could buy an easy birth of omamori (amulet) from one of the temples as a nice souvenir.