Boy help for an eleven yea old?

there is a boy a like we are in a day camp together. it ends friday,and I will tell him i like him then. i think i should kiss him but my friend said eww no hes grody. i sad you can't help who you fall for. the question is, how do i kiss him? do i just lean in to him and plant my lips on his? how do i kiss? do i just brush my lips across his? we will never see each other again so i want to give him something to remember me by. yesterday people were telling him tha i like him and he thought they were joking so i tink im gonna say "thoses girls weren't joking on tuesday" and then kiss him. is that a good plan?