There are many ways to make a perfect summer night, but one of my all-time favorites is this:
Bike downtown just after the sun sets, when it’s still warm enough not to need a jacket. Go far enough (or fast enough) to work up a thirst, then find a restaurant or bar with patio seating for a meal or a drink (or both). Hang out, enjoy the evening, bike home, maybe take a detour so you’re extra worn out by the time you get there. Then sleep really, really well.