There are many small, fine stores in downtown PV which offer an assortment of wonderful clothing and arts and craft items. Glassware and artwork are prominent. If you're shopping for food items, there are several large supermarkets. Be prepared to rub shoulders with the Mexicans. The range of fruits and vegetables is amazing.
Beer is cheap, as is alcohol.
There are several excellent enjoyable beaches in Puerto Vallarta. Playa Los Muertos, or the Beach of the Dead, is located in Old Town, PV, and has lots of activity. Mismaloya has a terrific sandy beach, the water is clean and warm. Go North to Punta Mita, about a two hour bus ride or 1 hour cab ride and there are some fantastic white sandy beaches. A ponga can comfortably hold 6 or 7 people.