If you still have the available space, I have found that for Tourist heavy Cities it is beneficial to keep the resident Sims traffic separate from the Visitors.
I have a Casino City (not yet developed) but have all the resident Sims roads networked around the Highway entry point.
Once I have the available funds, I will select Highway and draw a long road from the Region connection, underground and connect up my City coast-line where I intend for the entire coast-line to be a Casino haven.
I believe this will keep the resident Sims traversing their own network and the visiting Sims will hit the Highway all the way to the coast-line.