Skip-the-line tickets for St Mark's Basilica are genuinely useful if you're only in Venice for a day or two and don't want to waste 45-90 minutes in the sun. The basilica itself is smaller than you expect but incredibly rich—every surface is covered in gold mosaics and marble. Expect a fast security check and then 20-40 minutes inside before you're gently moved along. The real value comes when you add the terrace access (highly recommended) which gives you close-up views of the famous bronze horses and a great panorama over Piazza San Marco. Without it you're basically seeing the inside from ground level only.
Best time to go is April-May or September-October. Summer crowds are brutal and the heat inside can be unpleasant. Expect to pay around $35-55 for a basic skip-the-line entry with audio guide. Guided tours run $90-130 per person depending on group size and whether they include the Pala d'Oro and terrace. My advice: pay the extra for the terrace and Pala d'Oro—it's the best part. Skip the super-expensive private tours unless you're traveling with kids or need a very small group; a well-reviewed small-group tour is usually plenty good enough.
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