Psalm 84: 5-7 – New American Standard (NASB)
5 How blessed (happy) is the man whose strength (oz – force, security, majesty, praise) is in You, in whose heart (lebab – heart, mind, understanding) are the highways (mesillaw – “lifestyle”, main road, pilgrimage) to Zion!
7 They go from strength to strength (chayil – “force” an army, wealth, virtue, valor, strength), every one of them appears before God (Elohim) in Zion.
There is no definable place called the Valley of Baca; one Bible atlas did ID a city by that name but it is not by Jerusalem.
All of the words in blue are added into the NASB translation and these come from a variety of sources that include several translations and concordances.
Dry Valley pic is from http://www.hsipro.com/Picture%20Album.htm