Planning for my parent's golden anniversary

My parents are celebrating their 50th anniversary this coming 5th of June. My siblings assigned me to think of the best theme and location for that event. While seeking for some in the internet, nothing stood out aside from that marriage tours which offers a lot of choices. But I still need your suggestions. Ya know, this is so important for me and my siblings, that's why I need it to be perfect and exciting! I hope to hear from y'all!