<human>: Hey r/travel! I'm a 17 year old high school student from Canada, I'll be graduating this June and heading to University next year.  Before I head off to University I want to experience California. I'll be 18 when I go.

I'm going to be adventuring by myself, I'm planning on bringing a backpack with a weeks worth of clothes and my Longboard.
I really want to backpack/longboard throughout California

Here's the plan:

-Leave for San Diego July 3rd

-Stay in San Diego for a few days

-Make my way to Palm Springs
-See LA

-Go to San Fran for a few days

-fly back from San Fran to Canada July 24th

What do I need to do in between these stops?
What do I need to see at these stops?
Any special towns, beaches, people to see in Cali?

I'll be bringing about $1000 to last me the three weeks.  
How should I shelter myself- hostels? Couch surfing? Hospitable redditors?

Can you give me a shortened version of the text?
<bot>: Going to California for three weeks in July with nothing but a backpack and a longboard.  What do I do to have fun and survive?