A pub crawl where the participants travel via bicycle rather than on foot. The group of people will try to visit as many pubs as possible in one day/night, having a set number of alcoholic beverages at each location.
A favorite activity in Portland PDX on a weekend afternoon is to go for a pub spin on the east side visiting as many of the local breweries as possible.
It's simple enough, if you seal up the leaks, your relationship will be airtight again, it wont be open. If your landlord or counselor or outside person died, you'd have nobody to seal the leaks but you and your other half.
Not everything needs to be loosened in life, things fall apart that way. An open relationship is one of them.