I would like to walk from the Siam Centre to Baiyoke Tower with my children aged 5,6 and 7. Is this easy enough and how long will it take? We had thought about having a meal at the top but the reviews of the food are not great. Is going up to the revolving viewing deck an experience not to be missed by tourists? Can you just turn up at any time to do this or are you supposed to book tickets at a certain time?