I want to set up a date for my parents. Ideas?

My parents have been maried now for 28 years, and they forgot how to have fun. I am now 23 and they still expect me to spend my time with them, and when I am gone (in another city, for college), they just keep thinking about me. I want to show them that they can have fun by themselves, that they are not that old to just stay forever at home and wait death.. Now their only fun activities are calculating the price of food to find the cheapest option (even though we do not struggle with money), and to fight with eachother for stupid little things, like two old people. Their life is impacting mine and I can't do anything without my father saying that it is too expensive, or my mother complaining just for the heck of it.

What can I do for them? Give me some ideas. This week it was their anniversary and I went with my father to buy her a gift and everywhere we went, he just calculated where are the cheapest flowers, and got her a potted flower for 10 bucks, to put in the garden... pathetic. I need something to force them to go somewhere, but I can't prepay a restaurant meal, can I? I wanted to make them go bowling, but you pay 3 bucks per entrance, there is no way I could get a voucher for that. The next theatre where I can get tickets is 2 months from now, and at the cinema there are only cartoons, horror movies and one superhero movie, none of which are suitable. I wanted to buy them a voucher for a massage, because I have gotten that for my girlfriend a while back in another city, but I could only find erotic massages in my home city.. I need something, idealy, where they could not see the prices up front (like a menu, or posted on the wall). What ideas have you got?

I want to set up a date for my parents. Ideas?
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