Spice Up Sex Ideas (for long term relationship)

My boyfriend and I have been dating for 5+ years and sexually active together since 4 months into our relationship. Because we started dating at 17 and we’re a very sexually curious couple, we’ve had our share of experimenting.

We are going away next month on a week long cottage trip by ourselves and I wanted to try some new things to try to add some fun into our vacation - but I’m not sure what else to try since we’ve experimented a lot already. Any recommendations?

We’ve already done sexy lingerie, spanking, choking, car sex, beach sex, balcony sex, handcuffs, blindfolds, rougher sex (crossing lines into responsible BDSM), shower sex, sex at the drive-in movie theatre. Any other ideas?