I personally feel that heavy petting or fondling of breast should
not be displayed in public where there are others around.
People might not be as open minded as you are.
What's more is that this is a very private affair that should serve
as
wonderful memories of what both of you had done before.
Such actions are only exclusive to the both of you, and others
should not have the privilege of enjoying the show.
In just my own opinion, i think hugging or a kiss on the
cheek/mouth in public is already the best form of showing affection
to each other in public. So why go further? Respect yourself as an
individual and also your partner's feelings.