Teleport player into minecart or boat

How would I teleport a player into a minecart or boat?
And I don't mean in the same block as, I mean actually in it.

2 Answers

This is actually possible with a BE-exclusive command, /ride. Here is the basic syntax that you'll need:

ride <riders: target> start_riding <ride: target> [teleportRules: TeleportRules] [howToFill: FillType]

• riders: The targets you want to begin riding on top of the ride.
• ride: The ride that you want riders to begin riding on top of.

Sample command:

ride @p start_riding @e[type=minecart] teleport_rider

Edit: See this answer, it’s better

Sorry, I'm afraid you can’t. You can however, just tell the player to right-click through /tellraw and hope they listen:

/tellraw @p {"rawtext":[{"text":"Get in the boat."}]}