I've booked a few tee times for Manago CC in Tochigi-ken for 12 April. The weather should be nice and spring-like then, and hopefully we can see some nice color.
The tee times are at 9:34, 9:41, 9:48, and 9:55. Cost is 11,800 including lunch, which is a steal in April.
The course is easy to access by either train or car. There is a club bus at 8:50 from Shin Tochigi station on the Tobu line, only about 1 hour from Kita-Senju, so quite convenient.
EDIT: I added an extra tee time, so now we have room for 16 people!
Here's what I put together for tomorrow. Please let me know if you have any requests for groupings, this can still be adjusted.