Peru Trip (3 USA Guys, Late 20s) – What’s Worth Adding?

Looking for some input from people who’ve actually done Peru.

It’s me and two buddies (all mid/late 20s, from the US). We like good scenery, unique experiences, solid food, some nightlife, and generally places that feel worth the time. Not trying to luxury travel, but also not trying to do anything reckless or chaotic. Just want to make the most of the trip.

Here’s what we have locked in:

Friday (arrive 12:30am) – Lima

• Plan to check out food / bars / flea market type shopping
• Fly to Cusco Saturday morning

Saturday – Cusco

• Morning LIM → CUZ
• Light acclimation day
• Walk around, explore, just get settled

Sunday – Sacred Valley

• Pisac ruins + market
• Ollantaytambo
• Maras salt flats / Moray terraces

Mon–Tues – Machu Picchu (permits secured)

• Circuit 2A Monday
• Circuit 2B Tuesday
• Back to Cusco Tuesday night

From Wednesday to Sunday (fly home Sunday to the USA) we’re open.

I'm leaning Arequipa/Colca Canyon and Lake Titicaca but need to think on and get opinions.. Imagine domestic flight cost are no issue, but being time efficient, and enjoying the travels priority.

Ideas we’ve tossed around:

• Arequipa + Colca Canyon
• Lake Titicaca
• Amazon (Puerto Maldonado / Tambopata)
• Paracas + Huacachina
• Or just staying around Cusco or Lima longer

Main question:
If you had those extra 3–4 days after Machu Picchu, what would you personally prioritize? Anywhere you’d spend more time or skip entirely?

Appreciate any real advice, open to advice in the areas i'm locked in too.