A bucks night has been an traditional bachelor 'misters' party, also known as stag party, stag night or weekend. This is the "last party" for when a bloke get married, for a "last chance of freedom".
The bucks party is normally arranged by the best man with the assistance of the groom's friends. However, things have changed away from the pub crawl and loose night out and expanded into fun exciting sports, arcade games or a weekend away beer/wine tasting. It doesn't have to be a night from The Hangover, but everyone can still have fun. Some couples are having combined events from 'Showers' to 'Getaways' that involve just the wedding party members. This is a great idea have the time with your partner while keeping the feel of a last party before the wedding.
There are many options to choose from and it really depends on what suits you!
Here's some ideas:
Massage / Day spa
The options are endless! If you can't decide, there are companies that will help you plan a night out with your friends you won't forget.