I have been to Malaysia and Pinang too. The best is to book a guided tour or rent a car and see hot spots of the island, like temples,beaches, musea, etc, etc. or buy a map and discover the gems of this beautiful island and Malaysia as well. Have a nice trip.
I have never been to Rostov na Don but I should book a guided tour to learn more about the city because they know where to go and visit.
I have been to Bandar Seri Begawan and enjoyed it very much. Seeing interesting places and buildings as well as nature parks and the beach. The best is to book a trip to one of the major cities or to see rural Brunei.
Well, Melaka is a nice city, past and present is there. I have no info about the hotels as I travelled by coach from Kuala Lumpur to Melaka city and stayed there a couple of hours.Perhaps wikipedia or Malaysian Travel Bureau can give you more info.