I live in the area and boat here. Rumsey Island is off of Rt 40 and Joppa Farm Rd. Down the street on JFrd is a big full service marina called Gunpowder Cove Marina. No restaurant but everything else. Further down the road is a really nice park called Mariner's Point Park. We launch one of the boats here...38 Scarab...and we have lots of room to swing it. Super nice park. Just be careful with waterways back in there...they tend to get pretty shallow. There's a narrow channel that leads from Rumsey out under a train bridge and then you are on your way into the Bay. From there you can pick a direction and depending on your speed, you can hit some fun hang outs in 30 to 60 minutes. Happy to show you around and introduce you to some local boaters if interested. Welcome to the neighborhood.