Sex location????

So my boyfriend and I of almost 3 years are sexually active, but we have trouble finding places (& time) to be... most of the times we’ve had sex has been in the car, but even in the car, we have trouble finding places to park. We’re 17 & 18 so we both still live at home. We can get a hotel room, but it’s expensive and I’m not sure what I’d tell my parents... Do y’all have any ideas of places we can go?