Any major Chinese city during the October national holidays. It takes 2-5 times longer than normal to travel even short distances. October holidays are amateur hour and brain dead drivers will behave in new and increasingly dangerous ways on the roads as tempers flare. Public transit is clogged with confused out of towners. Every restaurant of note will be packed 3 days before, 3 days after and all of the holidays. Getting in at Pizza Hut can be tricky. If not sold out completely, even minor attractions will be completely unenjoyable due to crowding and general claustrophobia.
Bars and clubs are packed which may be a good thing depending on your tastes. Hell even grocery stores are crowded.
The public bathrooms are …… woefully under maintained for the sudden surge in visitors. Like you can see a second pile where people started going after the pile that formed on top of the clogged toilet reached ass height.
Cambodia for sex tourists—- lot of normal “lonely” men in Thailand but the Cambodia crowd was decidedly creepy. I’d guess that 50% of them would happily take a 15 year old back home. The PP girly bar street was stomach turning.