Perth is a beautiful city with plenty of things to do and see. Here's an ideal itinerary for 3 days in Perth:

Day 1:

Start your day by visiting Kings Park and Botanic Garden, which offers stunning views of the city skyline and the Swan River. You can take a walk through the park, enjoy a picnic or visit the Western Australian Botanic Garden. After that, head to the Perth Cultural Centre, where you can explore the Art Gallery of Western Australia, the State Library of Western Australia, and the Western Australian Museum. In the evening, head to Northbridge, which is known for its vibrant nightlife and delicious food.

Day 2:

Begin your day by visiting the Fremantle Markets, which is a bustling market filled with local produce, crafts, and souvenirs. After that, head to the Fremantle Prison, which is a UNESCO World Heritage Site and one of the most significant convict sites in Australia. In the afternoon, take a stroll along Cottesloe Beach, which is one of the most popular beaches in Perth. You can also visit the nearby Indiana Tea House for a drink or a meal while enjoying the ocean view.

Day 3:

On your last day in Perth, start by visiting the Swan Valley, which is located just outside the city. The Swan Valley is known for its wineries, breweries, and distilleries, so you can spend the day tasting some of the best wines and beers in the region. In the afternoon, head back to the city and visit the Perth Mint, which is one of the oldest mints in the world. You can take a tour of the mint and learn about the history of gold mining in Western Australia. Finally, end your day by taking a sunset cruise on the Swan River, which offers breathtaking views of the city skyline.

I hope this itinerary helps you plan your trip to Perth!