If I'm not drinking $.40 swill in a campground parking lot on a budget climbing trip....
Avoid large beer manufacturers. Rice is not an ingredient in quality beer.
Try a bunch of different stuff, and figure out what sorts of beer you like, then explore the options in those varieties. Your tastes will probably evolve over the years, so keep trying new things every so often.
I stick with micro brews for the most part, but do like a few readily available imports in UK bitters, Guinness, Kilkenny, Innis & Gunn, etc. IPAs can be an acquired taste but once you start to like hops, there's no turning back.
Mainly these days I drink IPAs, porters/stouts, and a hefeweizen on a hot summer day is pretty hard to beat. Mix in a few other varieties when a change is needed. The first couple beers I fell in love with were Guinness, and Boddingtons.