The only place where you can find Crab Ramen is in Yasubei (安兵衛) in Shuzenji Onsen. You just have to walk for around 10 minutes to Miyuki Bridge, cross it and you'll find a traditional Japanese restaurant open for visitors and customers alike. The Crab Ramen is only priced at ¥600. They also serve service water and tea. They also have a huge space for group customers with a traditional Japanese setup of table and chair sets.
Hakoyu is a historical onsen along the river valley. Inside consists on one bath in a large wooden tub. Very relaxing, though no outside area.
Cost is 350. You pay at the machine and hand the ticket to the attendant. This onsen has no shampoo so bring your own or its only 50 for a small travel sized packet. Towel rental is 100yen.
The shoe locker is pretty large and fit my day pack. Inside the lockers are a similar size. Fantastic way to enjoy the area.
Manju-sho Honzangenraku Shuzenji Main Store is a local delicacy store in the heart of Shuzeji Onsen. It is a must-go delicacy store when you're in Shunzenji Onsen because it sells specially-packaged Manju at a very faur price. This store is also located right across Yokko no Yu and is a walk away from Shunzeji Onsen bus stop. They also have cafés inside and the staffs are very polite to customers.