You can pay for a guide to walk you up to the Hollywood Sign at Sunset. The view up there as it turns dark is amazing and on our tour we stopped by the Griffith Observatory on the walk back down which is also great and amazing view (so many movie scenes are filmed there too). We learned a ton from our guide (who of course was also an actor). It was just something I throw onto our family trip a few years ago and honestly ended up being one of our favorite things.
One cheap thing...go down to Huntington Beach and do a campfire at night. They have tons of free firepits and alot of places sell wood. You can't do that on our beaches here (Gulf Shores, Destin, 30a).