I sadly have only one full day in Osaka

I arrive at 4pm in the afternoon, and I am staying 10 minutes from Namba Station so will do the Dotonbori area with the river cruise and see Hozenji.

Would this be viable for the day. Osaka Castle first, Umeda Sky building and floating Garden, Hepfive ferris wheel and Gudetama Cafe, Tempozan Ferris wheel, Abeno Harukas, Tsutenkatu tower Sumiyoshi Taisha.

Are two Ferris wheels too much?

Any advice would be wonderful.

I recommend to proceed as the following order.
�@Osaka Castle�AUmeda Sky Building�BHep Five�CTenpozan�DSumiyoshi Taisha�EAbeno Harukas�FTsutenkaku

�A
　　　　　　　　　　　　　　　　　　　　　　　　�B

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　�@

　　　　　　　　　　　　　　　　　　　　　　　　・Namba

�C

　　　　　　　　　　　　　　　　　　　　　　　　　　　�F

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　�E


　　　　　　　　　　　　　　　　　　�D　　　　　　　　

It takes about 2.5 hours for transportation and 7 hours for each spots. So if you start at 8:00 a.m., you may complete the tour until 18:00.
The followings are nearest stations for each spot.
�@Subway Morinomiya Station�A�BJR Osaka Station/Umeda Station�CSubway Osakako Station�DNankai Sumiyoshi Taisha Station�ETennoji Station�FSubway Dobutsuenmae Station



　　　　　　　　　　　　　　　　　　　　　　　　　　　　

The distance between �A and �B looks far. It was garbled after typing. It's very close in fact.

Have you checked Osaka Amazing Pass?

https://www.osp.osaka-info.jp/en/

It covers Osaka Metro, bus and Port Town Line and many attractions including the river cruise, Osaka Castle, Umeda Sky building and floating Garden, Hepfive ferris wheel, Tempozan Ferris wheel, and Tsutenkatu tower (and more).

Thank you for your kindness of a reply. Do you think i should do both Ferris wheels? I am interested in the Gudetama cafe, even just for a 1/2 hour.
Without sounding rude , when I googled it said the subway station from Nippombashi station is the closest to Namba Oriental Hotel and I would go from there to Tanimachiyonchome station and then walk 17 minutes to Osaka castle?

The castle has multiple stations nearby. No need to waste time or energy walking.