A guy will also talk a lot about his manly hobbies – hunting, shooting, fishing, doing manly sports, jumping with a parachute, DIY projects etc.
Also, guy is expected to be a good storyteller and to make a girl laugh.
You may feel a bit underdressed and will feel more in place if you wear a more feminine outfit.
That does not mean – you have to wear mini, but wearing a dress or a skirt and a top will be more appreciated than wearing jeans.
If you think that red roses are too cheesy – go for tulips (in Spring) or irises or even for romantic field flowers.