Good question. The foundational issue seems to be "how much increased risk can we justify in the name of pleasure?" "Risk" meaning not just the risk to ourselves, but the risk to everyone else. And then, does this particular trip fall above or below that threshold?
I have made two weekend trips since the pandemic began, one in the summer and one in the fall, both to visit my brother- and sister-in-law in northern California. Both times I traveled by car and stayed in their guest house, and socialized with them outdoors. I feel that those trips involved only a slight increased risk to myself, my husband, and those relatives (which they accepted), and a negligible increased risk to strangers, and I felt that it was worth it.
However, my husband wanted to do this trip again next month, and I said no. Infection rates have climbed significantly, and it will be too cold to spend hours together outside. Even though I've been vaccinated (I'm in the Moderna trial and lucked out getting the active vaccine), nobody else in the group has, and none of us is able to isolate at home for two weeks before or after.
I don't think flying right now is a good idea. I know the filtration systems on airplanes are pretty decent, and masks work better than we once believed, but you're still talking about a huge number of people in a very small space for what tends to be a pretty long time. I'm diligent about wearing a mask and minimizing my exposure and still managed to catch a cold recently. Anyone who hasn't caught COVID yet has to share most of the credit with sheer dumb luck, because we have yet to find a guaranteed prevention strategy.
I'm not persuaded by the arguments that foreign countries need our tourism dollars. Anyone concerned can still send money without visiting.
However, I am sympathetic to those who are feeling burned out on quarantine. I'm really lucky to live someplace where I can dive year-round without significant risk of exposure to the virus. I'm not sure how well I'd hold on to my sanity otherwise. We've all been asked to give up many of the things that make life worth living, and some have had to give up more than others. The end dates we've been promised have turned out to be overly optimistic, and it's starting to look like it might be another year before we achieve herd immunity through vaccination. I wish we could all band together and hunker down and get through this as quickly as possible, but I also realize how unfair it is to expect everyone to sacrifice nearly everything that brings them pleasure, indefinitely, especially when the risk to those specific individuals (and the benefits they'd gain through their sacrifice) may be relatively small.