What is the best insurance coverage for the second home condo use for seasoanl rental?

The condo has flood insurance, but I was told to purchase the coveage, I guess liability inside my unit. What is the inexpensive and reasonable coverage?

You NEED full liability insurance. The amount should be enough to protect your Assets. If some one hurts themeself at your rental property, there needs to be enough insurance, so that they do not come after your assets. If you have a standard (150/300 or 300/500) on that property, you might be able to get an umbrella to extent all of your coverages ( your primary as well) to a million or more. You also have to check with your insurer to make sure that the fact that this property is rented does not invalidate it for the coverage you are purchasing