PuzzleHead GeoArt - Riddles Mystery Cache

This is one in a series of caches for all you Puzzle-heads. The Puzzles are medium to difficult to solve, but the Finds are generally easy; i.e . Terrain=1.5 or 2.5, close to roads, no wading or bushwacking, and there should be minimal Poison Ivy.

As a break from all the more difficult puzzles, here are a few simple questions to answer.

1. If the sundial has the fewest number of parts for a timepiece, what timepiece has the greatest number?
2. What is the next letter in the following sequence? N, W, H, O, I, I ?
3. What is the next letter in the following sequence? A, E, A, P, A, U ?

Enter the 3 answers in order, with no spaces.

This cache is hidden along a somewhat busy road, so park off the road and watch the traffic.
The cache is a micro so BYOP and please just write your id and the date.

After you solve the puzzle, please don't give the solution away; let others enjoy the frustration of working on it, and the joy of solving it themselves!!