In reply to kmsands:
Maybe start Exeter, and paddle the river through the city then down the estuary to Exmouth?
Start near St David's Station, lots of parking. Short bit of urban river which is not the prettiest but it is interesting, then down through the historic Quay. A couple of big weirs, but they can be easily bypassed.
You could do a section of the Exeter Canal at this point, but it can be a long dull paddle. I would stay with the river. Ideally high tide would be around the time you reach this point, so about an hour in.
The tidal bit is reached soon and it's lovely with some v nice houses backing onto it and then some v nice boats moored on it.
If you got the tide right and it's still high but on the ebb, Topsham is a lovely place to stop and get refreshments or wander. Slightly further on the W side is Turf Lock Hotel, at the bottom end of the Canal. Great beer and food. You might be able to pull up on the shore, but if not as the mud is now exposed there is a good pontoon by the steps at the far end of the beer garden.
Head on down the river, which could be a straight paddle or a windy one as the sand and mud appear and you follow the channel.
At Starcross (pier and Brunel Pump Station make it easy to spot) there is a floating restaurant mid river. Food is amazing but expensive so maybe just stop for a drink. Last mile to Exmouth now amongst big sand banks which are worth pulling up on and exploring.
At Exmouth pull into Shelly beach by the yacht club.
You can finish here and one person has a 10min walk to Exmouth Railway Station and an easy direct train back to St David's Station where you started.
Day 2. Sea. Loads of it. East coast towards Budleigh, or West to Dawlish and Teignmouth. Normally either is fine, but obviously check the forecast and especially wind strength and direction. The mouth of the estuary can be a bit sporty with a 8knt+ tidal race, but that can be easily avoided by looking and route selection.