It's doable, but there is a realness / hardness tradeoff which makes other methods more attractive.
Powering LEDS with RF at 30 feet is difficult and inefficient.
Cheating so that LEDs 30 feet away are power by RF is doable.
Activating LEDS with RF from 30 feet is a doddle.
Activating LEDS some other way may be even easier.
RF or Inductive power transfer over 30 feet requires high Q resonant circuits, generally needs larger than smaller antennas and is liable to be hard and expensive to do well at a size and cost that is acceptable.
Inductive power transfer only transfers power to a matching load when the load is "in range" and well designed circuitry draws far less power when not loaded. RF transmitters "throw the power out into the aether" [tm] regardless of whether a load is present or not so must work at the maximum power level ever needed for the application. (You could arrange an interactive system that determines proximty and raises power level, butr complexity rises rapidly).
If you MUST transfer power then having the receiver coils close to your path will reduce the transmit power and/or coil sizes. You can then run wires to LEDs or other loads as desired.
Having the LEDs powered by eg batteries and detecting the proximity of a small portable transmitter is far easier than either of the above two choices.
Use of proximity detectors along the path is also easy. These could be ultrasonic (modules with 5 to 10 metre range cost under $10). Or light-beam-breaking or capacitive proximity or ...
As a guide to what can be achieved with range search for what MIT did sa few years ago.
Korea Advanced Institute of Science and Technology 2014 - 5 metres
Wikipedia - Inductive Charging
Wikipedia - Wireless Power