If you base it on the weather, ask yourself if it is worth going out when it’s raining, and if it is an area that gets a lot of rain. Some trails, like the ones that offer a view at the summit, might not be worth it in the rain.
On the other hand, riverside, lakeside, rainforest, and waterfall trails may be spectacular in the rain. Of course, run it by the safety regulations of the area, if there are any. Ask the locals.
If you base your choice on terrain,
then you’ll just need to find out if if there are dry routes, or if you have to go through water a few times.
It’s important to know where you are going so you can prepare better.
Be mindful of the access roads and road conditions during and after rain.
There are often trails around the lake that avoid fording water, which may best for rain hiking beginners. Still, prepare to get wet. You may want to go into the water to explore the shore from the lake side.
When you're more experienced you may want to explore areas off the beaten track. These remote places can't be reached from the path which is why they are mostly untouched and interesting to watch. You have to go into the water to reach these places, and swim along the shore or out to small islands. Move slowly, keep quiet, do not disturb the wildlife.
Some trails can get a bit muddy in the rain. You may have to crawl through a mud hole to reach a rare wildlife sight. Anoraks soak up much less mud than other clothes. Afterwards you can clean up in the lake.