During the daytime, you can be busy with sight-seeing, but use your evenings to have a romantic cycle ride together. Do not worry about where to take bicycles from, because many places rent out cycles for tourists in the Old Town, and you may use one of their services. A 20-minute tour will only cost you about 8.70 USD (which is 200,000 VND), and if your ride is going to be longer, you will be able to negotiate the rates too.