Southeast Asia forum

hello, i'd be really grateful if anyone could tell me whether they think this itinerary is optimistic.

We will land in saigon and fly out of Luang Prabang - and have 5 weeks to spend. My partner has never travelled before. We plan to head to the beach at Mui Ne so she can chill for a bit and then back to Saigon. From there we will:
get the bus to chau doc then boat to Phnom Penh . Then bus to Siem Reap. Then back to Phnom Penh and go overland to Laos. We will catch public transport/mini buses nearly all of the time. My question is whether this is too much ground to cover in 5 weeks and whether Mui Ne is worth visiting to chill for a few days or is it too far out of the way?

Thank-you thank-you thank-you!