I was just at the wedding of someone from my gaming club last weekend, and at their bachelor party a few nights before.
It was also not a "beer & strippers" event, him not liking alcohol and never being one much for strip clubs. (also, as he noted, his fiancee didn't mind him looking at girls so there was no "forbidden" aspect, and most of his friends didn't have a lot of money and a strip club can get pricey).
We ended up playing capture the flag with water guns and wiffle bats in a city park, watching movies into the night, ordering pizza, and doing typical "hanging out" type things.
A bit of wisdom he shared about his unorthodox bachelor party: "Some people see a bachelor party as one last stand of debauchery, I see it as a summation of your time as a bachelor. I never drank or went to strip clubs before because I wasn't interested, so why should I now? My time as a bachelor was spent with my friends, gaming and hanging out, just like now."