I myself is thinking of going their. Is it in full blossom now or is it over

There is a bus, but it was difficult to understand the schedule because I do not speak or read Japanese. Google Maps was helpful. There was not a train.

I was unable to in November of 2017, and the staff was no help at all. Uber changes rapidly, though, and may have more service now (it is controversial in Japan). You also might ask your hotel to help you arrange a return trip. If it's not beautiful weather, though, or green and flowery, then I would not bother unless you love airplanes.

Hi, They have public bus services from JR Narita and Keisei Narita station. Narita city community bus from Keisi Narita East exit is cheaper and JPY200. "Tsubuura route" bus take 10 minutes to reach at Sakura no yama. Bus schedule to Sakura no yama from Keisei Narita : 4 times a day. 8:49, 10:23, 14:23, 18:05. From JR Narita station East exit Bus stop 1 or 2 , JR Bus forward to Museum of Aeronautical Sciences in Narita take 15 minutes to reach there. They operate 5 times a day. They also have bus services from Narita airport Terminal 2 Ground floor Bus stop 13, it takes 15miniutes and bus fare is JPY240. You can check latest time table at each Bus stops.

公共の交通機関でも行くことができます。 コミュニティバスを利用する 成田市役所から「コミュニティバス（津富浦ルート）」に乗車し、「さくらの山公園」下車すぐ。乗車時間はおよそ10分。乗車料金は、大人200円、子供100円で、幼児・ 障がい者手帳保持者の方は無料です。お得な回数券は、車内で販売されています。 ※成田市役所：千葉県成田市花崎町760番地（最寄り駅：ＪＲ成田、京成成田、県道51号線沿い） ＪＲバスを利用する ＪＲ成田駅から、「ＪＲバス（三里塚・多古・八日市場行）」に乗車し、「法華塚」下車徒歩25分。乗車料金480円、9つ目の停留所。 HPより