Having honeymooned at PPR, I would recommend that you do NOT pay for an extra cocktail hour. What we did (at PPC, and it would work the same, probably even better, at PPR) was just let guests know to meet us at either the Lobby Bar or the Gabi Bar at certain times for cocktails. At PPR, those bars were not very crowded, and they are the nicest ... so you can easily mingle in those areas (the Lobby Bar is cooler and has tons of huge chairs, sofas, etc ... so that would be my recommendation) and not have to worry about extra costs.