Hi I'm going solo in September and have booked the Dolphin mainly for the reason it is so central to HS ,Boardwalk & Epcot also had a good deal. I have stayed at SS but to me it was an upgrade of PO or OKW. Yes it is close to DD but mainly you will be travelling by bus to all the attractions which after a night at the parks can be draining
This is my second solo trip and I will do keys to the kingdom this time last time I did the Wild Africa Trek which was well worth the fee. Apart from the parks I like to stroll around the resorts, use the different modes of transport ie the boat to Wilderness resort
I mostly do counter service but allow for a few table service meals . I was there for 10 days and had a trip via the Lynx bus to the Florida mall that was an experience . Whatever you decide you will have a fabulous time have fun