is there anything recommended or advised by others that should be seen while at The Summer Palace?

Hi Again .

I am planning on getting the subway to BeiGongMen ( North Gate ) - visit The Summer Palace - and then get a boat from the South Gate of The Summer Palace to the pier near the Exhibition Centre / Beijing Zoo.Does this seem ok - or would it be recommended to do this journey in reverse ? I understand that the boat runs in summer from 10am to 4pm ( from pier near the Zoo / Exhibition centre to the Palace ) but am wondering if the boat also runs at a similiar time from the palace to the pier near the zoo / exhibition centre?

Also - I understand that a normal entry ticket can be bought but also a combination ticket ( including entrance fee, Dehe Garden, Wenchang Hall, Tower of Buddhist Incense, Suzhou Street and Danning Hall). Im not too fussed with seeing everything in the park - but is there anything recommended or advised by others that should be seen while at The Summer Palace - or is a normal entry ticket enough. I cant do alot of walking etc ( due to an injury ) so would not want to squeeze absolutely everything in. Would definately like to see more of Kunming Lake on a pleasure boat while im there - but unsure of the other places. Any suggestion would be appreciated.

Thanks - Jeff