Yes, cherry blossoms bloom in February! You can use the Misaki Maguro Pass to avail of round-trip tickets from Tokyo to Miura, as well as dining and leisure options. Check these two itineraries out for fun day trip ideas.
Of the five years I've been Japan, this year was first time I've made considerable effort in checking out as many places in Kanto as I could, given the limited time and resources. This post contains a gallery featuring the spots I visited.
Tokyo Past 3's YouTube channel is back, and it opens its 2017 run with a short piece on mortality and cherry blossoms, recited over shots of spring in the Kanto region.