Oxus saidInvite them over to your table when dining out. Off the bat you'll have a few things in common -- same choice of travel destination, restaurant and cuisine, same-sex union, and other affinities to discover -- that'll make the conversation flow as freely as the wine.
Agreed. The type and extent of travel wasn't indicated by the OP, but if you're using hotels then you may have additional options, too. Depending on the place, if they have common areas and other amenities to use. But an economy motel likely won't offer much besides rooms and a front desk, and maybe a nearby 24-hour restaurant.
Two trips ago in February we stayed at a mixed place, instead of a gay B&B or resort as we normally choose when traveling together. Breakfast and also the well-appointed happy hour were both poolside. There was long tables for 8, and round and square ones for 5 or 4. We always chose the big tables, either joining others already there (after the customary "Are these seats taken?"), or wait for others to join us. We instantly became friendly with everyone, because that's what THEY wanted, too. I also find we meet more people at the more intimate B&Bs, resorts or boutiques, rather than at monster hotels.
So yes, surroundings & activities can make a big difference. You might join a day tour at a vacation spot. You can even deliberately work to have them in your travel plans.