We visited here in Mid-July. It is certainly a bit out of the way and it took us about 45-60 minutes to get here by motorbike. The drive itself is fine and the majority of it is via a straight road, the last part is a but rocky but as long as to go slow, you'll be fine!
The waterfalls themselves aren't that great, a trickle of water in some parts but the trek up there (30minutes ish) and the general surroundings is what makes it. The first waterfall you get to is deep enough to swim in and there's space to jump in too. Quite a dangerous climb to No.3 so I wouldn't advise taking young children up that way.
Remember to take plenty of water for the day and don't be fooled by the shaded parts, lots of sun cream and big spray too! All in all though a pleasant day out! Certainly worth going and getting out of the hustle and bustle of Nha Trang!
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