If you are offering to exchange cars or yachts, check that your auto insurance covers your exchange visitor. As with home insurance, auto and yacht insurance is usually in force for thirty days, but this must be checked with your insurance agent. Also, check with your exchange partner whether his insurance will cover you fully for liability and property damage.
When booking your flight, check that your insurance will cover you for cancellation because of illness, etc.
You may also wish to arrange additional insurance cover against your exchange partners canceling for similar reasons.
Special insurance may need to be obtained from your agent for driving or sailing in other countries than your homecountry.