You'd be amazed what can be done if she wears a big skirt. She can hike it up and sit on you and the skirt drapes around and covers everything. But if people are watching they'll know 'somethings' going on. (Fun on a train. ) Or if she wears 'Daisy Dukes' (with loose leg openings.) She leans slightly over a railing/fence, you push the shorts to one side and..... well take it from there.

As far as anal or facial, as was already mentioned, talk about it. Don't bring it up during sex but mention it before or afterwards while you're cuddling. Say, 'someday I'd really like to try this.'

Good luck!! And let us know how it goes.