If you have hovercrafts as your stag do activity then this North Wales Hovercrafting site is one of the best.
You will pilot a single seated, 1000cc, formula 3 hovercraft, they have steering and a throttle, the art of mastering your craft is all in the weight distribution.
This great circuit has both water and land to negotiate. With lots of demanding corners that need dexterity rather than speed however, you will also need speed and agility to get the finish line before anyone else.
Hovercrafting, a stag do idea like no other.