Recommendations for solo day in Osaka

Hi r/JapanTravel!

Visiting Japan for the first time in April (4-21) with some friends. I will have an entire day off to myself in Osaka on April 7 and was wondering if anyone had recommendations on interesting or fun things i could do solo (outside of the stuff below)

Currently we are planning on doing the following in Osaka:

April 5:
\- Osaka Castle
\- Tempozan market place **(exploring and looking around)**
\- **Kaiyukan Osaka Aquarium**
\- **Kushikatsu Daruma (exploring and looking around)**

April 6:

Exploring a bunch of streets and districts

\- Minami District
\- Shinsaibashi-suji
\- Hozenji Yokocho + temple
\- Abeno Haruka 300 observation deck
\- Dotonbori

Our residence will be in the Kita ward towards the north end of Osaka. We will be visiting Nara and Kyoto on other days, and ending off in Tokyo.
I have looked into possibly heading to Minoo Park or Himeji (not too interested in Universal Studios) but if anyone has other suggestions i am open to anything – restaurants to try, places to shop (thrifting!), shrines, day trips/hikes, bars, etc. I have no issues travelling away from the city center.

Thanks for any and all the help!