We stayed at the lighthouse after walking in from Tidal River. Its a decent walk, probably best left to more experienced walkers. Under current conditions, taking into consideration roads and tracks closed due to flood damage, its about a 25km walk one way. The terrain is relatively difficult, and involved plenty of climbs and a shoes-off water crossing. You'll need to carry all your gear (aside from a tent) so the pack weight must also be taken into account.
The accommodation itself is in one of three separate buildings. We stayed in the more expensive option, which was about $110/night. It's expensive for shared dorm accommodation, but its a special experience - the hot showers when you get there will make it seem worth the price!
The accommodation is basic - all in single-bed bunks. Some rooms have 4 beds, some 2. We were a group of 6, and we split over two rooms. Another group of 6 shared the other two rooms.
The "house" we stayed in had a large, comfy lounge with a great heater and a range of novels and a decently-equipped kitchen with a heater. The kitchen has pots, a microwave, oven, gas hobs, lots of bowls and cutlery and a fridge. The bedrooms themselves are unheated, so if you are staying in the middle of winter (as we did) you need some decent sleeping bags. Bathrooms (2 in our house) and toilets (2, also) are shared amongst all guests. The place was impeccably clean.
The lighthouse tours are meant to run at scheduled times, but we missed the scheduled tour time and we were offered a tour when we arrived. We declined (the thought of more stairs after the walk was painful enough) but we did the tour the next morning with people from the other 2 houses. The views are magnificent, and if you are there on a clear day its unforgettable stuff.
We returned via the slightly longer walk route via Waterloo Bay, which is surely one of the highlights of the Park. I was in pain in the last few kms of the walk, which may have been avoided by taking the shorter return route, but Waterloo Bay was really worthwhile.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.