5 Days Kyushu Island Itinerary, is ok ?

Hi Everyone,
Could you please help to check & advice my itinerary below is fine for a female travelling alone ?
Day 1:
Arrive in Narita Airport connecting flight to Fukuoka Airport, takes train to Karatsu.
To visit Katatsu Castle & Takatori House

Day 2:
Visit Yobuko morning market & then Nanatsugama.
Take train to Kagoshima-chou after that.

Day 3:
Take early morning train to Ibusuki to visit Nagasakibana, Healthy Land, Sands Spa and then back to Kagoshima-chou, takes evening train to Beppu

Day 4:
Visit 8 hells onsen & Takegawara
Take train to Hiroshima

Day 5:
Take ferry to visit Itsukushima Shrine & Mount Misen Summit.

Day 6:
Hiroshima Station to Nagoya Station depart at 6AM arrive 9:33AM. (I must be reached Nagoya by 10AM).
Many thanks!

Day 5 is pretty busy.
Ibusuki has trains about once an hour. And to see those attractions would take a couple of hours. Reaching Beppu in the same day would be possible if you plan to arrive long after 7pm. If you are staying at a nice Ryokan in Beppu than it would be a waste as you'll miss dinner.

Hi Joshua,
Thanks for your reply & the info.
I will book a hotel room only. Thank you!

Kagoshima has this amazing hotel. The hot spring is open to day visitors from 5 am... but it is hassle to get there so you might as well stay there.

Shiroyama castle hotel is set atop a hill will fine views of the city. The onsen looks onto Sakurajima island and the bay.

You don't really list your interests or approximate times about travel, but a few thoughts....
Day 1 is very empty. The two places are close by and neither takes long to see. Plus in Fukuoka you are missing one of the very best places in Japan - the Nanzoin Temple Great Buddha, just 20 minutes by train from Hakata Stn.:

https://www.youtube.com/watch?v=lT4VQFmHFyM

There are other places you can see and do as well to fill in the day. Have a look at:

http://www.thejapanfaq.com/fukpic.html

Day 2 - if you like squid, Yobuko is not bad, otherwise, rather unspectacular. The caves are much better. It'll take you 3 hours to get from Karatsu to Kagoshima-chuo though, most likely by going all the way back to Hakata Station. You are also entirely skipping Nagasaki, which is the most interesting city on the whole island.

Day 3 - No Sakurajima? That's like going to India and skipping the Taj Mahal. The hot springs are nice, but don't miss walking on this live volcano.

Day 4 - The Hells Tour is great fun, but only takes 2-3 hours at most.
https://www.youtube.com/watch?v=K2NNi8MLcXM
You should enjoy Takegawara though.
You might want to see the Takasakiyama Monkey Park & Aquarium also:
https://www.youtube.com/watch?v=zepPfkuqhok

Day 5 - Climbing Mt. Misen is a rocky uphill challenge. If you have a bunch of stuff, definitely use the lockers in the station and don't take anything you don't need.

Good luck.