I often get questions about taking family, portrait, or engagement photos outside amongst the cherry blossoms. That's not really my area of expertise, but here are some great local professional photographers that I can recommend.
Each has their own style and rates, so check out their websites to get examples of their work and to get their direct contact info. And I'd recommend scheduling a shoot sooner rather than later--they can be very high demand in the spring!
I don't have any formal relationship with any of these photographers (although we have hired some of them for our own personal family photos), so please contact them directly for availability, rates, or other inquiries. You can find their contact information on their websites.