I can't recall the price of breakfast - as a Diamond, I always get it. My apologies. Probably, considerably less than $34 for the "Continental," and they offer a ton of breakfast items.
Yes, these are things you can do in a day. Boso-no-Mura or Sakura, no problem and Narita-san and -shi are a few hours. The big problem with Tokyo is there are days and days to do in and around Tokyo (like Nikko and Lake Chuzenji-ko.)
As I recall, there is a decent rail link from Haneda to Narita aas wlel as bus. Ah, here's a
link to information.
Misawa - I spent a winter up there, brrrr! Aomori province can be cold, lots of snow. April you should have much better weather than that. Lots of lovely Spring weather in central Honshu!