Going to St. John - Trunk Bay on your own?

[AdventureMode]

Is this the tram that costs $21 for adults and $12 for kids?

Yep, that's the one.

Which is better at St John's, trunk bay or honeymoon beach?

I can't speak for Honeymoon Beach, but I looked at pics online and it seems to offer the same level of tranquility and quasi-remoteness that you would expect from any secluded St. John beach. That said, I don't know what amenities are available there. We did drive past it on the way to Trunk Bay, and it is closer to Cruz Bay (where the ferry drops you off) than Trunk, so it's reasonable to suggest it may be a hair more populated just due to the proximity. You won't get that same enclosed/wrapped feeling you get at Trunk, though, because the coastline is more open there (take a look through Googlemaps).

From a friend of mine who has traveled often to St. John, he says the top two beaches there are Trunk and Cinnamon (Bay), which are two coves right next to each other. Visually-speaking, Trunk has a lot going for it. I couldn't recommend it more.