DL does not have a dedicated hotel/resort entry like DCA. So in theory, you'd enter DCA walk through the park to the front of DL. Where our room was in GC, we were extremely close to the DL/DCA park entry breezeway. (the main entrance) So, we walked to the main entrance. Please also keep in mind the park reservation system. I believe in the morning you will be allowed in either DL or DCA, pending your reservation. I don't believe you'd be able to both park hop and rope drop by going through DCA to DL. Now, this could have changed by the time you travel, but keep in mind the park rules / reservation entry allowance.