I live by the sea. My morning walk along the beach today consisted of overflowing bins, tied up carrier bags and tied up black sacks next to bins. I counted 5 disposable BBQs.
I also saw rubbish strewn everywhere, as the seagulls and foxes had an overnight party opening up bags and feasting on the remains.
I love the visitors. I love what they bring to the town. I enjoy seeing the camper vans parked overnight along the seafront. I don't love the vast swathes of rubbish they leave.
If visiting a beautiful tourist place, put your rubbish in your vehicle and take your mess home with you. Particularly if there's no room in the bin. A black sack next to the bin is completely unacceptable when it can easily go home with you.
My council tax is paying to clear up your daily mess.
YABU - there's a reason there's bins.
YANBU - you should leave places as you find them