I make that drive to HH from Savannah all the time. I usually don't use the expressway but go the other way on Highway 17, I believe it is. I'm terrible with street names, but somehow I don't think make a right at the blinking light are the directions you're looking for. I will say several things about the interior route should you get directions and decide to take it. From the Savannah Bridge to
DVC HHI is about 45 to an hour depending on traffic. The route is in one of those areas that presently has a lot of construction of new homes so sometimes that can slow you down and sometimes that can freak you out because construction guys can drive like crazies. Also, they do this thing I hate where the road you take actually has a couple of names that switch off and the names for the turns can be misleading. Lastly, as I said I take that route all the time for work so for what it's worth I do drive it, but I'll warn you that that area of the road is on the list for one of the top five, or ten I can't remember, most dangerous roads in the United States. Basically what I'm saying is if you were my best friend and we were meeting up there, I would just tell you take the expressway. It is a little bit longer, but the chances of you getting turned around are way, way less.
Having said ALL of that, have a super great trip. I love HHI resort. I think it's really pretty. I hope you have great weather. Lately, it's been sporatic. If you want to do some shopping or the weather is bad and you want to go to the movies, check out the new Sea Turtle area in Bluffton. It's really cute. All the stores aren't in yet but the ones that are are nice and the movie theater is great!
Wonderful trip!