We'll start outside Sakuragicho Station. If you arrive by JR, take the West Exit and walk to the middle of the square. If you arrive by subway (Blue Line) take the North 1 Exit (there are more than one Exit 1, so make sure to get the right one) and walk to the middle of the square.

Places to stop and opening hours:
Cosmo World (11 am - 8 pm, sometime longer)
World Porters (Shopping: 10.30 am - 9 pm; Restaurants: 11 am - 11 pm; Cinema: from 7.30 am till last show)
Cupnoodle Museum (10 am - 6 pm)
Marine Walk (11 am - 8 pm; Restaurants till 11 pm)
Akarenga Souko (Building 1: 10 am - 7 pm ; Building 2: 11 am - 8 pm)

Early to late morning or late afternoon (for the night view)

Especially on sunny days it can get crowded, especially in the Akarenga Souko. Best avoid or go early in the morning if you do not like crowds.
The Cosmo World is often closed on Thursdays, you can check if they are open here: http://cosmoworld.jp/calendar/ (If the day is grey, they are closed)