Minatomirai is one of the best place to hang out with. M and I spent time in Minatomirai few times. There is a theme park called Cosmo World where you can ride roller coasters, haunted house, previously largest Ferris wheel and other attractions. There is even arcade so you can take sticker photos of you two.
Land Mark Tower is a place to go if you are looking for a nice view of Yokohama, Bay Bridge. The view is beautiful
Marine Tower by the Yamashita Park is quite tiny but you can see a very nice night view of Yokohama. Marine Tower is less crowded than land mark tower but it is quite cute. Unfortunate thing about Marine Tower is that you can almost see stranger’s apartments from the tower.
If you are looking for the best view of Minatomirai, walk from the Red Brick Building to the Yamashita Park. M and I had a great walk together and this is the view we saw from the walk. If you want a moment just for you, this is a place to be. I have to say walking around this dock and spending some time at Yamashita Park allowed us to bond but benches may be very full on the weekends and holidays.