1) take bus there, us$ 1.05
2) u can,take the bus 260 to downtown LA then metro system to hollywood, but it takes a long long time from Anaheim to LA, almost 2 hrs
3. newport beach is near Anaheim but not special, if u have time, u can take the bus to huntington/laguna beach
4. u can rent a car to outlet, but it is very expensive to rent a car for one person, better share with others.

i forgot where the convention center is, but all of the above places can reach by bus.
gardenwalk like 830, but i am not sure, u can check out the orange county bus system/google transite, they will show u how to go to these places.
the last bus of 260 like 8:30pm, so u have to make sure u can get the last one.