We want our guests to look and feel their best in what they wear. Dressing up a little is always appreciated by the bride :)
Renting a car for the weekend is not necessary, unless you plan on visiting sites like the Getty or the Griffith Observatory. Taxis and ride shares will be readily available for transport to/from the airport and wedding events in Santa Monica. If you're feeling adventurous, bicycles can be rented along the beach and many of the larger hotels offer free bike rentals as an amenity to their guests.