Are you discussing a roller speargun? if so, no. Locals get really angry if you shoot fish. They can do it, but you can’t. That’s not the law, that’s just what happens. Expect to get hassled.

If you mean a roller luggage, that’s totally fine… but I recommend getting one that’s a little more heavy duty. Osprey makes good ones. I think they also make one that has backpack straps zipper up. Don’t go to Walmart and purchase rolling luggage that has tiny little cheap wheels. Get something that will last you a long time. It’s an investment.

As far as tourists go, that totally depends on where you are in the city. Phuket is fairly large and the “tourists who get drunk and want to fuck” generally congregate on the one “red light district” street. In BKK it’s spread out in the pockets around town. Don’t expect to get off the airplane and see drunk tourists everywhere you look driving through town. There aren’t that many of them, but they usually hang out in the same areas.