"Seishun 18(jyuu-hachi) kippu" cheaper than regular fare.
regular fare : 1310Y/oneway adult
Seishun 18 kippu : 2370Y/one day unlimted ride any "JR" trains except LtdExp and Shinakansen.
(No children type ticket)
But "18" is not one day only ticket be careful read all.
http://www.jreast.co.jp/e/pass/seishun18.htmlOne date stamp means one traveler as one day.
http://livedoor.blogimg.jp/b70hs5el87/imgs/c/a/ca1f87ae.jpgSo group(until 5) travel possible as one ticket.
Also fr Sinjuku to Sodegaura stn by ExpWay bus more convenient.
But not cheaper than JR 18 also regular ticket.
Just comfortable,fastest and easiest(no transfer).
Tokyo German Village :
http://t-doitsumura.co.jp/access/German Village part is "Doitsu mura" in JP.
Around Doitsu mura no famous shrines/temples.
Back to Narita(near NRT) by JR trains via Chiba stn
or by Tokyo wan(bay) ferry fr Kanaya to Kurihama.
http://www.tokyowanferry.com/_file/MAP_L.pngAfter Kurihama take a local bus until Keyuu Kurihama stn(Not JR)
then to JR Kurihama by walk 5 min away
then take JR train to Kamakura.
Kamakura is one of very famous sightseeing spot.
http://www.city.kamakura.kanagawa.jp/kamakura-kankou/en/plan/Also access convenient fr/to Shinjuku no need transfar by JR Rapid train.
(18 coverd if take Green car need Green car ticket plus)
Map :
https://s18.postimg.org/ofzgexyop/tokyo_bay.png