What is the most intimate romantic/sexual thing

Like two weeks ago, when our two friend groups were out clubbing, my girlfriend and I broke off from the group and went to this local park.
We found some steps that led to a lake, and we sat down, took our shoes off and dipped our feet in. We lay back on the steps and held hands.
We probably sat there, side-by-side, for the gist of an hour. We made out after (wink wink), but I really did love just being with her, looking up at the starry sky.