As a rule, PDA (public displays of affection) is not common. Even before the archipelago became the largest Muslim nation in the world, it seems this was the case.
Families show affection by kissing their young children on the head or cheeks, but once they have passed infancy this behaviour disappears. Mothers and daughters will affectionately pet each others hair or massage one another, but there is no kissing. Young kids are taught from an early age how to blow kisses when they say “da da” but I think this may be an influence from the West via Jakarta.
The ‘steamiest’ couples go only as far as holding hands, cuddling and teasing. Pashing is not a pastime and I don’t encourage visitors to Indonesia to go full on French style in public places, even if you are in Bali and succumbed to a few ‘arak attacks’. Such romantic explosions may indeed be slightly more tolerated on this Hindu outpost, but it doesn’t mean you shouldn’t respect local etiquette. For sure, the Balinese are used to the ‘spontaneity’ of honeymooners; in fact most young guys delight in seeing the displays, but it embarrasses most other people.
In terms of greetings, in Java, a light, almost feminine, handshake, often accompanied by a casual touch of one’s chest is how you greet someone; in Bali you can hold you hands in a prayer position in front of your chest.
In a nutshell, consider saving the fondling and the tonsil tickling for the flight home!
