A food tour through the stalls sounds nice! Maybe even the jawbreaker shooter thing as rough playing, but that might be too heavy for the budding (pun intended) friendship they have (although Natsume probably needs some pushing like the gif above). They could talk about the special flowers while they're hanging out.

Edit: Ah, there's a flower viewing log, too. It's likely better to have a picnic there! That seems to fit everything.