As a couple, Tapas & Food Tour works.
The value of a food tour is entirely in the route and the guide. A good small-group one (think operators like Devour or Wanderbeak, capped at a handful of people) walks you into vermouth bars, market stalls and pintxos counters you'd never find, in neighbourhoods like Gràcia, Sant Antoni or El Born away from the Rambla, and explains what you're eating with wine or cava along the way. A generic 20-person Rambla 'tapas experience' is the opposite — overpriced, rushed and touristy. The catch: even the best costs far more than doing it yourself, so it's a fit for time-poor first-timers, not for confident self-guided eaters.