Actually Top 5 is not enough when you are visiting Malaysia. There is so much to offer. However, due to the Group Writing Project organised by Darren Rowse, I have to limit to Top 5 only. Here are My Top 5 To Do when visiting to Malaysia:

1. Visit Petronas Twin Tower, KLCC

The 88-storey building is the world's tallest twin structures. Located in the heart of the capital city, the crown of the Kuala Lumpur contains a complex of office buildings, conference halls, a sprawling park and an upmarket shopping complex.

Inspired by the geometric shape found in Islamic architecture, this mega-structure was designed by Argentinian-American architect Cesar Pelli. Stretching out to one side is the spacious and beautifully landscaped KLCC Park. Other attractions at KLCC are Suria Shopping Complex, Petronas Philharmonic Hall, Petrosains Science Centre, Petronas Art Gallery and Kuala Lumpur Convention Centre, where The Aquaria Oceanarium is situated. Even, the "french spiderman" was very much interested at the twin tower, caught twice trying to climb the tower, 1st attempt in 1997 and 2nd attempt in 2007.

A Famosa

2. Join heritage tour at Malacca
The city of Malacca famous with its history. The Portuguese colonised Malacca from 1511 to 1641. The first thing they did was build a fort overlooking the river, calling it A'Famosa. A seven-month attack by the Dutch just about destroyed the entire fortress, leaving only the entrance façade and the structure of a church at the top of the hill. The Dutch then built The Stadthuys in 1650 as the official residence of the Dutch Governor and his officers, it is a fine example of Dutch architecture of that period. It is believed to be the oldest Dutch building in the East. Then came Chinese leaded by one of the great Chinese explorer, Admiral Cheng Ho. They slowly adopted Malay culture and now they are known as the Baba and Nyonya. Today, they have become the main uniqueness of culture in Malacca. Other attractions are Jonker walk, kampung mulu's mosque, portuguese square, St. John Fort, St Peter church etc.

3. Climb the Mount Kinabalu
Mount Kinabalu is South East Asia's highest peak at 4,095 m. Within its boundaries are found lowland rainforest of the tropical zone at its lower level, the montane oaks and fig trees, the rhododendron shrubs and wild berries of the temperate zone at its medium level, and the conifers an other alpine-like associations of the summit zone at its upper level. Where else in the world can you find a complete ecological system such as this, compacted in one small area? The best time to visit the park, especially for climbers, is during the March and April dry season.

4. Live like local at Sarawak Culture Village, Kuching
The Cultural Village is located at Pantai Damai, Santubong, just 32km from the state capital, Kuching. It is the perfect place to get introduced to local culture and lifestyle. There are about 150 people living in the village, demonstrating traditional daily activities like the processing of sago and the making of handicrafts. They wear traditional costumes and also put on dances for visitors. There are replicas of buildings that represent every major ethnic group in Sarawak; longhouses of the Iban, Bidayuh and Orang Ulu, a Melanau tall-house and a Chinese farm house. The village also has a theatre, where you can enjoy a multicultural dance performance. You can even get married at the Sarawak Cultural Village, in traditional Iban, Malay, Bidayuh or Orang Ulu style.

5. Snorkelling at Perhentian Island
The island is situated 21km off the coast of Terengganu which consists of the islands of Pulau Perhentian Besar and Pulau Perhentian Kecil. The island has superb white sandy beach, cristal clear water and unspoilt jungle. It is a sanctuary for fishermen, migratory birds and tourists.
Located just off the edge of the Pulau Redang Marine Park, Perhentian got excellence underwater seascapes for snorkelling and scuba diving. Tourist also enjoy windsurfing, sailing, canoeing and deep-sea fishing.

Special thanks to Tourism Malaysia

If you need further information on this topic, please leave in the comment. I will revert back in the same comment column.