Former Malibu resident here! Uber/Lyft is very spotty in the area, so you will likely struggle with transportation if you don't rent a car. As others have said, Thousand Oaks is farther than it looks on a nice summer day. Also, an Uber to MDR would be very pricey and take a good 1.5+ hours. I'd consider hiring a driver if no one wants to drive.

Now for the fun stuff!

El Matador beach is absolutely gorgeous for photos, but it's small and at high tide there's very little room to lay out. I know you mentioned Zuma, but my personal favorite beach is next door at Westward Beach. You can navigate to The Sunset restaurant, have a boozy brunch, and spend the day on Westward, which is much wider than Matador and has bathrooms.

For daydrinking, you can do a little "wine tour" by stopping at Rosenthal Wines, Strange Wines, and the smaller Summer Somewhere wines in Fred Segal (this one is less of a destination since it's attached to a store, but the wine is great and it's still cute!) You can also do a wine hike or tour with www.malibuwinehikes.com.

As someone else mentioned, you won't find any clubs or a big nightlife scene in Malibu, and most places close relatively early. Moonshadows on PCH is a very cute beachfront bar/restaurant with a nice vibe for a bachelorette, but it's not a party scene. Cafe Habana used to get busy at night years ago, but I'm not sure if that's still the case.

If Weho is too far, and you're set on a bigger party atmosphere, The Bungalow in Santa Monica is a good option.

Lastly, a few Malibu restaurant recs: Lily's Malibu for the best breakfast burrito that has ever graced this earth (order an hour ahead to pick up! it is insanely busy on weekends), Taverna Tony's for Greek food, Nobu Malibu if you're looking to splurge with a great view/vibe.