Hotel Del Coronado, Coronado, CA https://hoteldel.com/
The Del is a synonym for iconic. Approaching its 130th anniversary (!) this 28-acre resort is located on what is arguably one of the best beaches in San Diego and offers 679 guestrooms, 78 oceanfront cottages and villas, 65,000 square feet of indoor and outdoor function space, and just about everything else. There is a reason it is an icon.
Many (many) group activities are available, including a sailing regatta (right from the property), surfing lessons, or, because they are iconic, anything else you want to create.