The parks, although if you are there for more than a day then it is Alekander Park.
There are 2 tickets booths for the palace tickets which we didn't know. One is outside and the vendor only speaks Russian. There is another one inside, go in through the café and then it's to the right. There are also free toilets in there. The ones outside cost 20 rubles but are in excellent condition.
When I visited again in June 05 there was only the inside ticket office. Visiting times for individuals were 12am till 2 pm and 4 pm till 5 pm and most importantly security wouldn't let you inside before the ticket office was open for individuals, so no cafe or toilet visit inside. But they let us in at 11.15 am, so be on your guard.
Foreigner entry fee to garden 100 rubles, to palace another 500 rubles.
You are not allowed to take pictures in the now finished amber room.
Fondest memory: Spending two weeks there, eating in different cafés, walking around and always feeling safe, even at a late hour.
One of my mother's favourite spots in the grounds was the Marble Bridge, which is located close to the Girl with a Pitcher statue. This piece was added to the park in the 1770's. . .
Fondest memory: We easily spent over an hour walking through the grounds ~ and we didn't see all there is to see. You can follow maps in various guidebooks or, better yet, just dispense with any plan and take your pick of the many paths. . .they all seem to lead somewhere interesting.
The grounds of the Catherine Palace are extensive and wonderful for wandering. There are pavilions, bridges, statues and pieces of interest every 500 metres (at least!).
Fondest memory: I love Moorish architecture, so the Turkish Baths (1852) were a favourite of mine. . .I'm sure they would be even prettier on a sunnier day.
Pushkin is quite small and easily walkable, once you've made it to the town. Catherine Palace is probably the main draw, but we consider ourselves luckier to have made it to the Alexander Palace. . .
Fondest memory: Although not as impressive from outside, Alexander Palace offers more historical and personal interest. . .I'd recommend visiting it first, then walking to Catherine Palace and touring the grounds and palace (if time allows).
Catherine the Great hired Charles Cameron to design and build her gardens and grounds. He was also responsible for adding the Agate Rooms and the Cameron Gallery.
Fondest memory: A brief tour of the palace is warranted, but our main enjoyment came from walking the exntensive grounds and from admiring the buildings in their natural setting.