I want to have sex with my boyfriend, but..?

Okay, so, Im 15, he's 14 but acts well grown.. We've been dating for 2 years and some, and we've talked it over, and agreed that we're both ready. The only problem is my parents are WAY too protective.. even though they've put me on mirena. He also has condoms just to add to the effectiveness.. Another problem that snowballs off the "my parents are way too protective".. we have no place to do it.. So what I want to know is, what's one place we could get away with it? Like someplace public, yet inconspicuous..