Medano Beach is the place to be and to be seen! Conveniently located in downtown Cabo San Lucas with restaurants/bars and loads of things to do including:

Parasailing
Kayaking
Jet Skis/Wave Runners
Banana Boat
Water Taxis to Lover’s Beach
Safe Swimming

I suggest you pay for your beach activities right on the beach. Many times the vendors will negotiate a better price for you.