We are quite lucky that our climate is very interesting for tourists from any part of the world.
Surely there are some good ideas to boost tourism without vices as its reasoning.

Make KL more happening by combining city and jungle like promote KL Forest Park canopy walk or FRIM treetop bridge.
Upgrade night markets with live band, street magician, or even food treasure hunt, not just jalan-jalan, but got activity also.
Add more cultural spots with real kampung vibe , like Kampung Baru food walk or silat demo with teh tarik session.
Open more rooftop places with wow view and chill vibe , maybe got acoustic show, sunset yoga, or Insta photo zone.
Create cool local art trail , like graffiti hunt, pop-up gallery, or mural selfie contest with small prize.
Offer hands-on stuff tourists can join , batik painting, cook nasi lemak with makcik, or join durian tasting war.
Make LRT ride more like city adventure, each station got small story, challenge, or snack trail to complete.
Add one-of-a-kind attraction lah, like “Biggest Dart Frog Zone outside Amazon” or “Only Albino Polar Bear in SEA” , something people confirm want to see.
Make hidden café and kopitiam hunt into a game,collect stamp, win local dessert or free kopi.
Organize KL “night culture fest”,mix food stalls, traditional dance, and modern DJ, sekali jalan.