Our money just goes to more instruments, costumes, etc to make even grander offerings. Incidentally they consider laughter an offering so the dances include comical sections that can get outrageously bawdy. They may even throw in an English or Japanese joke or two because your laughter is an offering too. Lots of great places to eat in Ubud. Honeymoon Bakery for pastries.
Food is excellent.
Local warungs are fine. Try brem with ice and lime, refreshing and local. Ice is delivered most mornings from a plant that makes it from distilled water but you can ask first to be sure. Most Balinese in Ubud were careful of their water themselves. Beware of arak-attacks, a local drink that can creep up on you.