James'd gotten wind of Lily's intentions through Sirius earlier in the day. He felt himself get excited at the prospect not only because it was a fly around, which meant a chance to show off, but also because it would give all of them a chance to forget about the events of the last few days and just loosen up. In cahoots with Sirius, he'd dragged Moony and Wormtail along despite their protests that it was dark and probably not safe with everything going on.
Underneath his arm was his Silver Arrow 900, a revival of the old Silver Arrows that were the best racing brooms in their day. He smiled to himself as he trudged along a ways behind Lily and Molly, hoping that he could just get up and go, letting the wind run through his hair and losing himself in the familiar feeling of flying. The Gryffindor Quidditch team also needed a good impromptu practise after last match... even if it was unofficial and only half of the team was present.
As soon as the Pitch was in view, James grinned widely and turned back to call out to Sirius, "Oi, isn't that sight always enough to make you giddy?!"