Claudia
I, too, would recommend using the drip system. While soaker hoses can also be "hidden" under rocks, "trees", etc., they should not be buried. Nor are they the most efficient water use for your application. A soaker hose typically spreads water approximately a foot wide (and 6 inches deep) along its entire length. Using the drip system, the main distribution line can be buried (shallow is all that is necessary) and feeder tubes inserted where ever needed. Individual 'drip' heads can be installed for each plant that needs watering without wasting water on "roads" or rocks. And drip system components have progressed to the point that you can get not only the standard drip heads (where the water slowly accumulates, then "drips" off), but spray heads that act as miniature irrigation systems.
If you do decide on the drip system, there are two components you MUST add (both will be described in the drip system guide that is either included in the package you buy or available at the store where you get your components). The first is a pressure regulator. Too much water pressure and you can blow the fittings apart. It's not expensive; the last one I bought at Wal-Mart was under $5.00. The second item is a filter. The grade or style you need will be determined by the mineral content of your water. Your water utility can tell you exactly what the mineral content is. An easy way to tell is by the taste -- if the water tastes good, it has a light content. If it tastes flat, it has a very low content. If it tastes funny, or chemical, or metallic, it has a high content. Filters aren't terrible expensive either, running from around $10.00 to over $40.00 but will greatly extend the life of your system.
And you may even want to consider putting the system on a timer so you don't even have to remember to turn it on and off.
Good luck with which ever way you go --
Kevin
PS: When you install the components, install the filter first (connected directly to the water outlet) then the regulator. The filter will work more efficiently on the higher pressure water and the regulator will last longer with filtered water.