My favorite place to view Cherry blossoms, so far, is Yoshino park. Compared to Senganen Gardens and Koutsuki River, it is further away, but so beautiful when the trees are fluffy. The entrance is free, and they have strollers for rent which is convenient for parents with small children. It is a huge park with ample space for barbecue and relaxing by yourself or with loved ones.
It is 25 minutes by bus from Kagoshima Chuo Station and has well over 800 cherry trees which usually bloom in Early April. I highly recommend this spot to anyone who would like to get lost in a sea of cherry trees.