Absolutely. Many travelers pair Erawan with Kanchanaburi's wartime sites, like the Bridge on the River Kwai, since both sit along the same route from Bangkok. A private day trip lets you set your own order and pace, spending more time wherever interests you most.
Yes, several pools are open for swimming, though the resident fish are known to nibble at your skin - a strange but harmless local quirk. Long-tailed macaques roam the trails too, so keep bags zipped and food out of sight, since they're quick to grab anything left unattended.
Plan for at least half a day. The seven-tiered waterfall stretches roughly 2 km (1.2 miles) from base to summit, and most visitors spend 3-4 hours hiking, swimming, and stopping at whichever tiers catch their eye - enough time to see the highlights without rushing.
Erawan Falls is one of Thailand's most photographed waterfalls, its turquoise pools cascading down seven tiers named after the legendary Hindu elephant Erawan. Add 550 square kilometers of limestone forest, wildlife, and swimming holes, and you get a full nature escape without an overnight stay.
Erawan National Park sits about 200 km (125 miles) from Bangkok and 65 km (40 miles) from Kanchanaburi town. A private transfer typically takes approximately 3 to 3.5 hours each way, door to door, so you arrive rested and ready to hike rather than juggling bus transfers and fixed schedules.
The first three tiers are the easiest to reach and the busiest. With more time and energy, push on - tier four has a natural rock slide, and tier six sees the fewest visitors of all seven levels. The trek to the upper tiers covers roughly 2 km (1.2 miles) one way over uneven, sometimes slippery ground.