If you’ve only got a day to see this jewel of the Adriatic, there are a few ground rules that you need to obey. Firstly, be selective in what you want to see. Don’t try to cover everything. Venice is such a treasure trove that it would be impossible to do it justice in just one day. Secondly, set off early and get to the principal sites before the huge crowds descend on them and make life unbearable. Thirdly, don’t try and walk everywhere. It will be exhausting, especially in August when the temperatures are at their highest. Invest in a day pass on the vaporetti (water buses) and use the traghetti (gondola ferries) whenever possible–they cost only 50 cents. Lastly, combine visits to key sites…