Plan a Brilliant Day Out for Friends Visiting Your Area (Without Burning Yourself Out Hosting)

I'm hosting [WHO IS VISITING] for [HOW LONG] in [YOUR TOWN/CITY/AREA] and I want to plan a brilliant day out that shows them the best of the area without leaving me knackered as host.

Here's what's useful to know:
- About my visitors: [AGE GROUP, INTERESTS, ANY 'LOVES' OR 'HATES', WALKING/MOBILITY LEVEL]
- About me as host: [HOW MUCH ENERGY I'VE GOT, WHETHER I'VE GOT KIDS/PETS/OTHER COMMITMENTS, ROUGH BUDGET]
- The day itself: [DATE OR ROUGH WEATHER, WHETHER WE'VE GOT A CAR, ANY TIMES WE NEED TO BE BACK]
- What they've already done in the area on past visits: [LIST OR SAY 'NOTHING — IT'S THEIR FIRST VISIT']

Please plan me a realistic day out that:
1. Has a clear shape — when we set off, when we eat, when we head back
2. Mixes one or two obvious things they'd be sad to miss with at least one local gem most tourists wouldn't find
3. Includes a proper food stop (pub lunch, cafe, market — whatever fits) with one alternative in case the first place is full
4. Has a Plan B for bad weather
5. Builds in some quieter time so I'm not running them ragged from 9am to 9pm
6. Notes anything I should book or check in advance

Give it to me as a simple itinerary with rough times, plus a short 'host's notes' section at the end with two or three honest tips on how to make the day flow without me needing to be a tour guide the whole time.