There are so many great hikes in the area with ranging levels of difficulty! Check out All Trails for some great recommendations in or near South Lake Tahoe.
Suggestions Near South Lake Tahoe: https://www.tahoepublicbeaches.org/ Note: The beaches get crowded EARLY. If you plan to go to a public beach, get there early to secure your spot and parking! Lakeside Beach - Very close to the wedding venue and South Lake Tahoe. Fee to access this beach (typically $25/person), but most hotels and AirBnBs near Lakeside Beach offer a coupon bringing entrance fee to $5/day. Camp Richardson - https://www.tahoepublicbeaches.org/beaches/camp-richardson-resort-beach/ Zephyr Cove Cave Rock Lake Tahoe Nevada Park - public parking lot Meek's Bay - has parking that fills up early Baldwin Beach Nevada Beach El Dorado Beach North Lake Tahoe: Kings Beach - great public beach and a lot of food options - we got engaged here! Incline Village Sand Harbor Beach - the very scenic pictures of large rocks and clear water of Lake Tahoe can be found here