Yea, some times the traffic can get a bit harry on busy days, lots of things on the road to dodge, golf carts,(lots and lots of those, you don't even know) bikes riding 4 abreast, people walking, people on roller blades, skate boarders, and tour trains.(You get behind a tour train that is behind a golf cart that is behind a roller blader, ugh, it will take you all day to get where you want to go.) Parking too can be hard to find as it is VERY limited. If your heart isn't set on bringing the bikes I would say leave them on the mainland and just rent a golf cart or take a cab. If your staying over some places will let you rent the golf cart over night. Keep in mind the island is only 3 miles long and a mile wide at the thickest point so nothing is really very far. Whatever you decide you'll have a great time.