There are more than a couple of ways to make a suggestion, such as
1) How about going on a picnic?
2) Shall we/you go on a picnic?
3) Why don't we/you go on a picnic?
4) Would you like to go on a picnic?
5) What about going on a picnic?
What I'm wondering are
- Can 4) be normally used in this case? - I mean when the speaker wants to go on a picnic with the listener.
- Does 5) have exactly the same meaning with 1) ?