Regarding the beach at Mullet, it's the same as always--some days it's dead flat calm and some days there are huge rollers. Some days you can walk straight off and some days there is a huge cliff. Regarding the food places on Mullet, as of now, Rosie serves when there are ships in, but I don't think she is open (still) when they are not. Daleos had not reopened when we were there in June. As far as car rental places, everyone has their favorites. Haven't personally been through Philly in years and years, so no idea on that. Enjoy your trip!