the shortest way to get there

The shortest way to visit Bonsai Art Museum in Omiya-koen from Narita Airport is by leaving from:
-Narita Airport Terminal 1 Station
-Take the blue line: Skyliner
-Stop in Keisei Ueno Station
-Change to the orange Utsunomiya line in Ueno Station
-Stop in Toro Station

Then you can just walk to the museum. this will take you around 1h30m

Below is a map you can check:

https://www.google.com/maps/dir/Narita+Airport+(NRT),+1-1+Furugome,+Narita,+Chiba+Prefecture/Omiya+Bonsai+Art+Museum,+Saitama,+%EF%BC%92%E4%B8%81%E7%9B%AE-24-3+Torocho,+Kita,+Saitama,+Saitama+Prefecture+331-0804/@35.7726702,139.867502,11z/am=t/data=!4m14!4m13!1m5!1m1!1s0x6022f379d1bd3757:0xd56e29a162771aa1!2m2!1d140.3928501!2d35.7719867!1m5!1m1!1s0x6018c6cef9595555:0xdfd721860af8434d!2m2!1d139.6333418!2d35.9287713!3e3