a VirtualTourist member from Moscow
The bus 434 from Sintra train station goes firstly to Moorish castle and then to Pena palace or vice versa (Pena palace -> Moorish castle ) ?
And what itinerary is downward for walking - from Moorish castle to Pena palace or from palace to Moorish castle ?
Answered in another forum but for the benefit of future readers here is the timetable link
The bus goes to the Castelo Mouros (Moors Castle) before the Pena Palace.
I cannot help with the second part of the question as I have never done that.
I walked from Pena Palace, through Parque da Pena, down to the morish Castle and from the Moorish Castle I walked down to Sintra-Vila. It is a lovely walk. The weather was not the best when I visited so there were no views, but the path passes through lush and green vegetation.