Also, wormholes are a perfectly plausible idea for travel, if they were to work similar to black holes, their infinite gravity would.. oh.. I'll just show some pictures.

Blackhole, infinite gravity, so essentially its "tube" goes on until it hits the other end of spacetime (since it curves and stuff)

Notice the similarity with a wormhole. (Yes, this image has scaled down dimensions. Our universe is three dimensional, curving 4 dimensionally, with spacetime bending for gravity, also in a 4 dimensional direction.)
Sadly, getting anywhere near a blackhole will cause you to be destroyed from the ridiculous amount of radiation, let alone once you actually are absorbed by it. I'm pretty sure travelling in 4 dimensions would be pretty awkward too.
But perhaps there is some way of creating something or something oh I don't know.. But I honestly do think that wormholes are the most realistic(lol) method on long distance space travel, I wouldn't be surprised if other advanced beings used them.
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