Something good is coming and you want people to hear it. But "excited" can sound too much at work, and too flat with friends.
Way 1 · best default
Warm and natural. Shows you really want the day to come.
Examples
Ten days till Bali. I can't wait!
I can't wait to see you at the weekend.
In a conversation
A: Guess what, I've booked the tickets for the concert!
B: No way! I can't wait.
Common mistake
Not: I'm exciting for the trip.
Say: I can't wait for the trip.
"Exciting" describes the trip. You'd say "I'm excited", or more naturally, "I can't wait".
Way 2 · warm and work-safe
Positive and polite. Works with your boss, your neighbour or your gran.
Examples
Thanks for the invite. I'm really looking forward to it.
I'm really looking forward to seeing everyone at the reunion.
In a conversation
A: Are you coming on the team trip next month?
B: Yes, I'm really looking forward to it.
Common mistake
Not: I'm really looking forward to see you.
Say: I'm really looking forward to seeing you.
Here "to" is a preposition, so the verb needs -ing: "looking forward to seeing".
Way 3 · eyes on the calendar
You're excited about something weeks away and keep checking how long is left.
Examples
Three weeks till the holiday. I'm counting down the days.
The kids are counting down the days to Christmas.
Way 4 · british hype
Full of excited energy. Everyday British English with friends.
Examples
I'm buzzing for tonight's gig!
She got the place at uni and she's absolutely buzzing.
In a conversation
A: How are you feeling about the match?
B: I'm buzzing. I haven't slept properly all week.
Way 5 · low-key
Calm, understated excitement. Very British: you're pleased but playing it cool.
Examples
I'm quite excited about the new course, actually.
I wasn't sure at first, but now I'm quite excited.
Way 6 · formal email
The polite, formal version for emails to new employers, clients or officials.
Examples
Thank you for confirming the interview. I look forward to it.
Monday at ten is perfect. I look forward to it.
Read the moment, then choose the way that fits it best.
Pick one and practise it in a real conversation. Save the ones you want to remember.