Ok, I have a few questions: 
I'm planning to go to SFGADV this spring, but I have a few options on when to go. 
Does anybody know how crowded weekends in May are? I was planning to go Memorial Day weekend but with GL expected to open, that means crowds. 
Also, what is the weather usually like in late April? (April 20th-ish and so on) 
Finally, Does the park provide a two day admission ticket plan? I've only seen single day admission tickets on the website. 
Any answers will help, Thanks.