英语万能导游词的开头和结尾可以参考以下几种表达方式：

开头

Hello everyone, may I have your attention please？ Allow me to give you a general introduction.

Hi, everyone! It's my pleasure to be your tour guide today.

Good morning/afternoon/evening everyone! It's nice to meet you here!

Welcome to [destination], my name is [Your Name], and I'm your local guide.

结尾

Thank you for your cooperation. Today is the last day of the tour. I hope you have a rewarding and enjoyable experience. Good luck to come back home and good health.

Thank you for joining me on this tour. I hope you have enjoyed the journey as much as I have. Have a safe and pleasant trip back home.

Thank you for your attention. It was a pleasure to have you on the tour. Safe travels and see you again!

Thank you for being a part of our tour. I hope you have a wonderful time and take home beautiful memories. Goodbye and take care!

这些开头和结尾的表达方式可以根据不同的场景和需要进行适当调整，以确保导游词既专业又友好。