Ramona Falls is one of the most popular trails / hikes in the Mt Hood National Forest. At 7.1 miles round trip and ~1000 feet of elevation gain it is very accessible. Though do be warned the seasonal bridge that went over the Sandy River washed out several years ago and the Forest Service never replaced it, so you do have to forge over logs in the river. This can be very challenging early in the Spring and Summer when snow is melting and the river is raging and high.