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There's 2 ways to travel to the future.
1
Cryogenic suspension. That's easy, over 100 frozen corpses are already in liquid nitrogen, most of the recent ones used anti-freeze so there were no fractures in the brain tissue. Reanimation isn't perfected yet, but a microwave rotissery should do most of the reheating.
2
Approach the speed of light, about 99.9% as fast in a space ship and you go into a kind of hyperspace! Not only does time slow down, not much light will catch up to you from behind, so from your perspective you could fly across the galaxy in a couple weeks and all the stars would zoom past the front of the ship and to the sides, but behind the ship would be pitch black!
If you accelerate the space ship at 1.2G, it takes 6 weeks to approach the speed of light, then you have to decellerate as well for another 6 weeks.
Using conventional Newtonian physics, you would need an ION drive where the exhaust fumes were ejected atleast 50% the speed of light, and atleast 99% of the space ship would be fuel for a 2 way return trip back to Earth.
TO TRAVEL TO ANOTHER STAR
START --1.2G for 6 WEEKS --> 2 weeks hyperspace --1.2G for 6 WEEKS to slow down --> ARRIVE
Your space ship 1/3 the original weight to reach hyperspace, and 1/3 again to slow back down.
So a 2 way trip, assuming you can't refuel at the remote star, your space ship would be 1/81 it's original weight on return to Earth. i.e. 4 trips, each trip you need to exhaust atleast half the ships weight at close to the speed of light to approach the speed of light yourself. So 99% of the space ship must be super-efficient fuel. PRACTICALLY IMPOSSIBLE TO MAKE A RETURN TRIP. Robots might do it though.
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