After months of lockdowns, European leaders are preparing to lift some coronavirus-related travel restrictions and allow tourism to resume — with caution. “Our message is we will have a tourist season this summer,” European Union economic affairs commissioner Paolo Gentiloni told the BBC last week, “even if it’s with security measures and limitations.” Those measures include updating health protocols for hotels and public transit and expanding contact-tracing between member states. There are some overarching regulations, chief among them that non-European tourists will have to wait until at least June 15 to begin their visits. But much of the loosening of restrictions will be left up to individual nations. For example, the United Kingdom, France and Ireland have agreed to allow travel among them without requiring a 14-day quarantine in the final destination.