- Price: 19,000 yen (children 9,500)
The JR East Pass (Tohoku area) is a discount that allows unlimited rides on all JR East train lines within the designated area during five days (they don't have to be consecutive as long as they're within 14 days since it was first used). This usually pays off if using the shinkansen or doing long distances and is the most commonly used pass for travelling around the region.
(Photo from japan-iwate)
Tohoku Expressway Pass (good for those driving)
Unlimited use of Tohoku expressways through the tolls at a flat rate. The prices depend on the amount of days (consecutive) you'd want to use the pass, starting at 2 days (4000 yen) to 14 days (12,000 yen). You can check the same link for details on where to rent a car.
Oneworld YOKOSO / Visit TOHOKU Fare (good for those flying between destinations)
Flights from Tokyo or Osaka (some cases Fukuoka/Sapporo too) to different parts of Tohoku and to Sapporo. Domestic flights can add up quite a bit, especially to smaller airports, so if you're planning to fly you could consider this (of course comparing first with the price of buying tickets individually).
Treasureland Tohoku Bus Ticket (good for long distance bus travel)
Unlimited travel on 60 selected bus routes across Tohoku during either 4 or 7 consecutive days. The 4-day pass is 10,000 yen and the 7-day pass 13,000 yen. However, this doesn't include getting from Tokyo (or elsewhere) to Tohoku, so you could combine this with a bus from Willer Express, Japan Bus Lines or Meitetsu that could get you there. Willer Express also has a Bus Pass that covers a lot of long distance trips on the main island.
W-Kippu discount (for some selected local train journeys)
A ticket that gives a small discount for roundtrips when using slow trains on a few selected routes (Fukushima/Yamagata - Sendai; Koriyama - Aizu-Wakamatsu, etc.). Prices depend on the destination. Since the JR East Pass only goes for five days, you could combine the two in one same trip (along with day passes), using the JR East Pass for the more expensive journeys and the W-Kippu for these maybe cheaper trips.
City Day Passes
Loople Day Pass
Unlimited rides on Sendai's Loople Bus, which goes to most of the city's attractions, during one calendar day. 620 yen adults, 310 yen kids. Also includes discounts to some of the attractions.
Run Run Loop Bus
Unlimited rides on Hiraizumi's Run Run Bus, which goes to most of the city's attractions, during one calendar day. 400 yen. It pays off with 3 or more rides.
Shuttle Route Bus Nebutan-go
Unlimited rides on Aomori's Nebutan-go Bus, which goes to most of the city's attractions, during one calendar day. 500 yen adults, 250 yen kids, it pays off with 3 or more rides.
Hirosaki Apple Pie Coupon
This one is a bit strange, but I think it's fun. The Apple Pie Coupon includes the entrance to Hirosaki Castle, Tsugaru-han Nebuta Village, the Botanical Garden and Fujita Memorial Garden and a 300 yen equivalent souvenir (choose either postcards or guidebook).
They also give you a set of seven coupons (each one equivalent to 100 yen). They can be used to exchange for apple pies in participating cafes/restaurants since apples are Aomori Prefecture's speciality or to ride the Dotemachi Loop Bus (1 coupon for one ride or five coupons for a day pass).
It costs 1,500 yen and can be used over a period of 30 days.
Aizu Loop Bus Pass
One ride on Aizu-Wakamatsu's Loop Bus costs 210 yen, while a day pass for unlimited rides on one calendar day costs 500 yen. It goes to most of the city's attractions.
Hachimantai Area Passes
A collection of passes to travel around the Hachimantai area of northern Iwate Prefecture by bus.
(Image from tokaimon)
These are all the Tohoku passes I know of! I plan to use the W-Kippu on my upcoming trip and perhaps the Aizu Gurruto Pass too. I'll let you know how it goes. Any discounts I've forgotten?